What are your opinions on basing a site off of hundreds of longtails that range from 250-1000 local visitors per month all with $1+ cpc. I'm not sure how I think, I believe that it could be very profitable if the longtails are low competition. Along with that, I believe that after ranking for quite a few longtails my PR and authority would build up and I should be able to rank easier for higher keywords (20k+ competitive keywords). What do you guys think? and I wasting my time/money?