There are two reasons for this:
It takes some time for me to build up enough funds to request a withdrawal from many of these sites.
While I'm waiting to verify a site, I list it anyway so that, if it IS real, you don't miss out on time you could have been spending making money.
I include a short description of each listing, not for my own entertainment, but so you'll read it. If there is a listing that seems sketchy to you, don't use it. If your experience on a site differs from mine (i.e. I showed proof of payment but you have not received your payment), send me screenshots and I'll try to help you get to the bottom of it. Also, I'll update the listing to include your failed attempt at payment so other users know to proceed with caution i they choose to try it for themselves.