Hey varhau
I wouldn't worry too much about what kind of Free Sites Link Lists need - build & market to what you know you can sell - otherwise, you're just guessing at how to market the sites & that's never a good idea.
As far as sponsors & "spam" - that's not how this board works - we have plenty of
resources that you can poke around in, but if you looking for a sponsor for a certain niceh, please start a thread over in the "I'm Looking For....." forum.
Otherwise, we'd have
all over the place.