My issue with allowing for crowdfunding posts is that the board will quickly become overrun with it. If it's allowed there should be a subforum for it, otherwise we'll be spammed with it constantly.
I think you're right, Maurice. The "here's a link to our crowdfunding campaign" posts will start to push out any other content.
People are always welcome to reach thousands of TrekBBS members and visitors and inform them about new crowdfunding campaigns by purchasing an ad on the forum. Otherwise the forum just devolves into free advertising space--and then people get disenchanted with the forum's content and start to abandon it.