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Sig ads undermines his ability to sell ad space on the forum. why would an Advertiser pay theymos for a weeks worth of Ad time when they can get hundreds of thousand of ads for the same price through spam from users. this deprives him of profit along with he mods who get paid for banning you. shit rolls downhill and you're at the bottom.
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No, it's because they have lead to an increase in spam and clutter. I advocate for their banning and don't care about their effect on forum ad revenue. The forum has become so much worse to read since they've been around.