Rolia's voting system, in my mind,

IS USED TO HELP FRIENDS (I avoid to use member or guest) HERE TO:
- Decide which activity should we take
- In Staturday or Sunday, or Good Friday
- Which restraunt will we go
- And, I believe you have understand what I mean

and, in most cases,

IS NOT USED TO:
- Get public opinion on any hot topics,

So, in my opinion, we do need a vote system, and,
- It's for members only, since this is the easiest way for all of us to know who will attend in the voting activity
- It should be as easy / simple as possible (for both the designing and using)
- It should have a control point to avoid junk votes
- If Sailor is willing to do extra work, could also add a public voting system, for questions like these posts of "举手", "跺脚".