xprest1geCompetitive players are probably the most costliest players of any category. New users probably eclipse try hards/competitive players in the steam store purchases. New users are ignorant, it's a new game, they buy random shit, and have tons of fun with no complaints. Competitive players complain and plead Valve to make changes (costs them $$$), and probably don't buy much from the store at all.
I am not so sure about this given the number of unusuals, killstreak and australium items floating around the community, not to mention how many gift wraps have been sold so that top players can sign stuff for people. I am guessing the average 6s player has a much larger than average investment in TF2 than the typical pubber, we just make up a relatively small % of the customers.