There has to be more in it for them than "OP wants to be in charge, so we will go to OP's place and submit to OP's rules". And OP won't find out what that is as long as OP is asking a general place like HN "how do I collect all the stamp collectors on my site??" like they were collectible things, instead of going to a stamp collecting group and joining and contributing and observing what they might be missing that they don't know they are missing because they aren't technical enough to be aware of all the options, which OP could maybe build or contribute towards.
but that's not at all as exciting as being in charge, which I'm cynically suggesting might be OP's motivation.