When we use GPU, money from miners go to AMD's hand and doesn't comeback. When we use ASIC, the asic companies will use a portion of that money to promote their business, attract more users & miners come to bitcoin economy. This causes a positive feedback loop and bitcoin economy will boom. Right now, butterflylabs are promoting its business using google ads.
I guess someone out there might click their Google ad and find out about bitcoin that way, but writing "Bitcoin" on the back seat of a buss might be more effective marketing, to bring new money in...
I fully expect ASIC mining to bring a lot of new miners on board (mostly old bitcoiners trying out mining for the first time) and that's why I'm staying away from mining.
