People are not soloing to 50, They are grouping for dungeons FATES, and quests, the reason why people who mostly solo can even raise up to such a high level is they are fortunate enough to be able to utilize the high population to zerg FATES, and the High Population to get Q'd for the dungeons. The game just launched and the lack of a dispersed population level range wise has led to an abundance of group oppertuinity that can be used to advance, in a month or 2 it will be much harder to solo to 50, you wont have as much FATE access or dungeons. no one is Soloing to 50. Its just very easy right now to get a group or engage in FATES with inflated numbers due to the game just launching. its all temporary.