"it's rather easy to find what agents are using auto accept" for us or the companies? I think there's a certain amount of poetic justice in just sitting back and not dropping the dime on these agents.
For the companies, not us. I have no clue what agents are using auto accept. But every time you "ping" or connect to the vendor's site, some basic info is included, like your IP address (which, while technically can change, rarely does for most US broadband users, I've had the same IP address for about 3 years now) and the date/time sent. This is logged. So you just look in the log, see who is connecting every couple of seconds, all day long, and they've found you.
On the same note, they can also see if someone logs into the same account from two different IP's, which could set off a flag that the account may have someone doing data entry. And if multiple accounts, especially geographically diverse accounts all log in from same IP address, then that's a big red flag of date entry service being used.
All this is from my pre-real estate days. We had a client who had subscriptions to a website, and suspected people were sharing login accounts. With a few days of monitoring logs, we'd found multiple subscribers sharing logins.