Oh god no.
I mean it could be great for a large player base, but then we'll turn into a roblox/runescape/tf2 community. We would have close to 1 million players, not counting the trolls and Glass-esque people. Having people pay would filter out most of the scum, although 20 bucks for a game like this is pushing it. Why pay 20 dollars for this when you could pay 6 for GMod? Just saying.