It does not really catch spammers, but it does lure in scammers.
Mosy of them are from nigeria, and send send me emails to but products, for instance:
"HELLo SIR I AM INTEREST IN BUY YOUR LABTOB VOMPUTER FOR MY OFFICE IN LAGOS NIGERIA, DO YOU TAKE A CREDIT CARD OR CHEQUE"
I wil respond with Yes of course, and eventually find ut that the check is fake due to verification fom the bank.
Also the credit cards a always stolen from victims, so they get reported.
We toy with these people for months afterwards.