Why not just use PITS?
There are some technical hurdles that need to be overcome before Sitefinity gets added to PITS. I didn't want these challenges to get in the way of gathering valuable feedback today. UserVoice can be launched quickly (without requiring me to request internal resources) and gives us an immediate forum for these suggestions.
Moderation, duplicated ideas, abuse
To some degree, this will come down to personal preference. However, this is my approach: aim for engagement and then layer on moderation (or governance) as needed. Getting people to engage with systems is already difficult enough. I didn't want to make this even harder by adding layers of security & moderation? This is an experiment though and I might layer on governance later, if needed. For now, I'm happy with engagement though. :)
Re-entering ideas into PITS
Behind the scenes all of this stuff is going into TFS and PITS is fed by TFS. When Sitefinity begins using PITS, it shouldn't be hard for these ideas to re-surface.
The popular get more popular
I'm a bit concerned about this as well. However, in theory, good ideas should get accepted and will then migrate from the "suggested" to the "accepted". This is only day 2 so I haven't yet "accepted" any ideas. I'm giving the community time to sort the list.
Thanks for asking and for your suggestions. This is an experiment and a work in progress.
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