Do you buy or sell domains on Flippa?

[Gartnet]

I have seen a few auction posts on here that are linked to Flippa, while I always associated them more with selling websites than just domain names, It makes me wonder are you paying $10 to list your domain names for auction with Flippa?

Have you bought any domain names via Flippa?

It's not a marketplace that I visit often for domains, does it have hidden gems?