Why would scammers pay $10k for a list of people that would be hostile to them. Your argument makes no sense whatsoever. they are using auto-diallers, that dial numbers in sequence. those cost a few hundred dollars or less.
This number called. Claimed that 'they were calling about my credit card. No problems with my credit but if I wanted to lower my interest rate, I should contact them." I'm on the do-not-call list for all the help that does. Hey, Presidential candidates, promise to fix this and I'll vote for you!!