If your idea has been used, you get an award/discounts/achievement/avatar items, etc.
People can see what idea/improvement has been used on a players profile/achievement/avatar items, ect.
I see no reason that I should get a special award because I submitted an idea that was implemented. Just getting my request is good enough.
K y l e 023 commented
This was addressed here:
They won't be offering any compensation for ideas that are implemented
Great idea but what about people like me where I created a idea then someone a few days later made the same post and now my post is gone and his is the one that is left with all the votes.
trust me, as long time user of the windows phone uservoice it feels good enough just getting the email notifications that "your votes have been returned to you because XYZ feature has been added to the new system update"
and what about the people who's ideas don't get used? what do they get?