I've never really felt like I wanted to create an imageboard myself, but if I were to guess, I'd say it's probably gratifying when other people engage with something you've made/control. This is a very human feeling that also motivates artists (and many others too I bet). Additionally, creating a small community allows you to make it exactly how you like and to experiment with new ideas. I also suspect that some people enjoy the feeling of power and importance they get by being *the* site owner.
Personally, I've fantasized about making a website where people can spontaneously collaborate on projects. Like for example, someone records a guitar riff and uploads it, then another user adds a bass line, and then someone else adds drums or sings on top, until the song is complete. I've seen stuff like this happen on 4chan, but having a website specifically dedicated to this would be pretty cool. But I don't think I'll ever bother with it.
>>3544
>I have been very interested in creating a small online community
Looks like you could answer your on question, OP, let us hear it