That's because they charge now. The quality of the sites for sale is better than it was when it was free.
go to Flippa.com yo! It's the best. Also if you're looking at selling a bigger business, try to find some bigger customers from somewhere offline for best results.
Promote your site through online. Do SEO and PPC for your site. I think you will be definitely success in your online business.
I like flippa and ebay personally. I have sold quite a few sites both places but flippa is more consistent since that is all they do. Hope this help
The best place to sell businesses online is flippa.com of course. I have sold on different sites and flippa.com is the most effective for me.