> My girlfriend's sister (was ~10 at the time) is now banned from Roblox because she kept getting sucked into ERP with people in game.
You don't mean Enterprise Resource Planning, do you?
Stupid sexy Tally talk...
Unfortunately, no. ERP as in erotic role play.
Roblox has a nice parental control system, and is totally playable with chat disabled (and the preference password-locked with a special parent-held password).
Minecraft is the replacement - no IAPs (as far as I know), online community is pretty varied but pretty decent for the most part, and the game is lots of fun even completely offline.