Also keep in mind just because something has a certain number of votes doesn't necessarily mean they will (or won't) see it or work on it. While more popular ideas get more immediate visibility, I would not be surprised if the Scirra team actually does at least read every single suggestion. The ones with fewer votes are less likely to be responded to is all. If it is a good suggestion, I'm sure they take it into account.
The unixtime suggestion had like 10 votes and it got implemented very quickly (due to simplicity). On the other hand, the cloud/realtime collaborative editing feature has 100 votes and just isn't going to be done.
Rather than worrying about the number of votes, quality of suggestions is probably more important. If you feel a particular suggestion isn't getting enough attention, they do not discourage bringing it up on the forums for discussion either.
PS. Also remember the suggestion forum isn't really for the users, it is a tool for the developers.