*shrug* why bother, it's already been done many times by people who are very successful and dominate. Re-implementing other people's ideas without a very good change is generally not worth the effort in my opinion.
too much competition actually. also, marketing is hard these days as SB sites are now dime a dozen. think of myspace resource sites, few people who started it right after myspace was launched made millions. people who are getting into this now are not making pennies. there are exceptions however
submitting your site to social bokmarking sites,10-20 around a month is a very good and legitimate way to get load of traffic.
well, i think around $2 at around 3k impressions. When i have an article that gets a lot of votes in StumbleUpon for example, i will get over 10k impressions and $7-8. The click rate is not impressive, but the traffic is really good. They even subscribe to feeds.