Unusual suggestions are different than suggestions for unique items. Unusual suggestions often take more time, research and work. I think suggesters should be awarded more for creating unusual suggestions.
Right now you get 10 contribution points when completing a suggestion and 1 contribution point if you vote on an unusual suggestion that gets accepted. In my opinion, it'd be better and more stimulating if you'd get 20 contribution points for an accepted suggestion and 2 contribution points for voting on an unusual suggestion that passes, for example.
Basic reason is that if I want to update a regular craft hat it takes 5 minutes, maybe even less. If you want to update an unusual with many sales and an incredible amount of mini's that often appear, it could take up to 1-2 hours. I think suggesters should be extra awarded for that with extra contribution points.
TL:DR - Award more contribution points for successful unusual suggestions since they require more time and input.