Dreamer.
People have opinions and egos and like control. Remember, you are asking people to change things that they have invested large amounts of time and possibly money into, and do them ‘your way’ instead.
One primary reason there are all these different sites is that people have mutually exclusive views about how things should be done.
To put it another way, suppose you had a thriving site and astrocreep came along and told you that you ought to close it down and put all the content on mapcenter instead “for the good of the community”. I don’t know about you, but my first reaction would be “fuck off”
You might respond that you would only say no because mapcenter sucks, but that is a subjective opinion. In somebody elses subjective opinion, no matter what, your site will suck.
The way I see it, mapcenter already has the goals that you have set out, so your only reason for making your own site is because you don’t like how mapcenter is set up. To expect that other people would not feel the same way about your site is foolish. BTW, if it is the ads at mapcenter which bother you, there is a simple solution. Put $1000 into astros paypal account, and ask him to not run adds until that runs out. If you think setting up a site of size and bandwidth requirements is not going to cost you at least that much, you really are dreaming (or have the option of leaching off some already paid for resources)