Mashable have just mentioned Usuggest as a possible revenue stream for bloggers. From what I can see they have a very limited inventory.
As an example I did a quick search for “Diabetes” – a massive marketplace and loads of products… or there should be.
I just tried “diabetes” at USuggest and they had hundreds of matches !
You would expect some inventory improvements over 6 months especially when something is specifically pointed out.
It might be time to take another look