why should anet spend dev time to design a feature that allows f2p to get mounts and circumvent purchasing expansions? they are running a business and need to make money to keep the game going. Surely you can afford the $15 or whatever it is to buy the expansion
anet needs to get rid of all the servers, create 3 mega servers with a "casual" mode and a "elitist" mode. Then when you go into wvw you chose which mode you want to play