I remember signatures were removed from the WSO forum many years ago for the same reason. If we are expected to pay money to list and bump our threads then I do not think it's fair the first thing people see when they hit the page is an ad from the Warrior Forum at the very top of the page.
If this continues then I won't want to send any traffic or affiliate traffic to my paid forum threads. I'd much rather list the products on my own site where I don't have to compete with the Warrior Forum for attention.
I could understand if the threads were not paid threads, but they are.
What does everyone else think?