Personally, I get a kick out of helping newcomers to the hobby. There is real satisfaction in getting someone buzzing around with a huge grin! I figure the more people who see these little ring-dingers, the more people who will want one, and by building them I am helping the entire community. (And making a few bucks as well!)
I don't care what the eco nazis want us to beleive, One SUV puts out far more pollution than 5 motorbikes.