Some marketing databases hold more than basic contact details. They can reveal who has responded before, which offers caught attention, and which people may be more likely to bite again. That quiet trail of behavior has become a gold mine for scammers, especially when older and vulnerable people are part of the mix.
Federal cases have shown how “opportunity seeker” lists moved through the marketing world and into the hands of fraudsters. Those lists were built from people who responded to offers such as sweepstakes, grants, auto warranties, astrology, and other pitches, then sorted into groups that looked promising to the next seller. The result is a pipeline where ordinary consumer behavior can turn into a fraud roadmap.
In one major case involving Epsilon Data Management, the Department of Justice said employees used transactional data and algorithms to spot “responsive buyers” across a database that covered about 100 million U.S. households. That kind of profiling made it easier to identify people who might answer a mailing, return a call, or act on a flashy pitch. Once that data was in the wrong hands, it became a shortcut to the most vulnerable targets.
The fallout was massive. Epsilon agreed to pay $150 million, and two former employees were convicted after prosecutors said nearly 100 lists were sold to a fraudulent client. That client used the information in a scheme that defrauded more than 218,000 people, while more than 12,000 victims were hit over and over again. It was a blunt reminder that a lead list can do real damage when it is built around who is easiest to fool.
Other companies wound up in similar trouble. KBM Group entered a deferred prosecution agreement tied to millions of dollars in victim compensation, while Macromark pleaded guilty after lists it provided helped drive at least $9.5 million in losses. Wiland Inc. also reached an agreement with DOJ over data sold to fraudulent operators, and by June 2025 the Consumer Data Victim Compensation Fund had returned more than $129 million to victims across the country.
The playbook never really disappeared, either. In 2026, a federal judge sentenced Troy Murray of North Carolina to 121 months in prison after prosecutors said he sold lead lists packed with names, phone numbers, addresses, and sometimes ages and email addresses of older Americans. DOJ said his customers included lottery fraud crews in Jamaica, and from 2016 through 2023 he allegedly sent scammers at least 22,000 lists covering more than 7 million older Americans.
Those lists were not cheap throwaways. They reportedly sold for about $500 per 100 to 300 names, and prosecutors said Murray made more than $5.2 million while victims lost more than $9.5 million. For scammers, that kind of file saves time, money, and effort because the hardest part, finding someone likely to respond, has already been done.
What makes the situation even trickier is that similar lists still show up in the legitimate marketing world. Some are sold for legal advertising and are not proof of fraud by themselves. Still, names like “Prime Opportunity Seekers – Buyers Only!” or “Sweeps Winners Only” show how close the language can sound to the same kind of profiling that scammers love.
That overlap is exactly why response history matters so much. A person who entered a sweepstakes, replied to a promotion, or filled out a survey may look like a better lead than someone picked at random. Over time, those small actions can turn into a profile that says a lot more than most people realize.
There is also a simple truth behind all of this. People who have already shown interest are easier to chase than strangers. Once a name lands in the right database, it can be copied, sold, and reused until the same person is hit from multiple angles with mail, calls, emails, or text messages.
The good news is that it is possible to make that trail less useful. Search for personal information online, watch for data brokers showing your name, and opt out when possible. It also helps to think hard before entering sweepstakes or handing over extra details on a form, because even harmless-looking promotions can feed a marketing profile.
Using a separate email address for contests and promotional offers can keep your main inbox cleaner and make scams easier to spot. Never pay to claim a prize, never share bank or Social Security details to “release” winnings, and slow down before answering any unexpected message that says you are a winner. If something feels off, it probably is.
If money or personal information has already been handed over, speed matters. Contact the bank or payment provider right away, report the scam to the FTC, and use IdentityTheft.gov if someone has stolen personal information. For older adults, the National Elder Fraud Hotline can also provide help, which is important because scammers count on confusion, urgency, and shame to keep victims silent.
The bigger lesson is simple: a response can become a signal, and a signal can become a target. That is why the trail left by marketing behavior is so valuable to bad actors, and why even one extra click, entry, or reply can echo far beyond the moment it happened.
