Without any traffic at all this forum or any other would be dead and every forum or website needs money to run unless you can find free hosting, but this money isn't wholly dependant on sig spammer traffic. Whilst the board would take a huge hit in traffic it would do fine without it as do every other forum on the net. I'm sure many people would also donate if money was needed especially if the board wasn't populated with poor quality sign spam. As for how much the revenue and traffic would drop we will only know if it ever happens.