Their purpose is to take out money of the economy. SA's would only need the permission to do /lot draw, right?
They're also special, fun events that only happen every so often. If you do something to much, it loses its novelty. In addition, I see GAs getting spammed to do them every second.
Yes, but, if there's too many, people won't play them. If people don't play, no money is taken out of the economy.