Although I agree that having third person adds clear advantages, people simply still want to use it no matter how much you insist they shouldn't. Generally I stay in first person most of the time, but sometimes when I'm travelling long distances the movement just simply gives me a headache, even with headbob turned off. This is even more so for players with poor framerates, if you're running below 25 frames it can be very irking to be in first person for extended periods. Especially if you're still holding a melee weapon (nessesary if you're in a town) and I'm not talking about people playing on toasters either. Just seperate the servers, seperate hives is just an excessive measure. The advantage of gearing up in third person is negligible.
