What would happen if...

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Unless Buildism gets as popular as Minecraft and needs a $500 per month server, we shouldn't have any problems.

But then couldn't we just add a membership or run offsite links :o?

Yes.

I'd actually say run ads now. I'm sure users wouldn't mind - we've made the point across that you need money to run the site, and so you could add the ads at the bottom and top of the page, or on both sides of the page, or only on the Home page, or only on the Forum page somewhere.