How is it possible?

[SDaemon]

^^^^ This. And in a couple weeks it will take another couple days of playing to get 105+.

Already going to start having to buy non BiS slots for classes. (war, monk, smn, blm, and sch)

The ONLY way it is possible to have 105+ as a fresh 50 after a couple of days is to have another class at 50 that has set up the gear for you weeks in advance. And even then if that gear-set was i90+ from the get go, gaining that other 10+ ilvl will take at least a week if you don't have the soldiery already saved up to dump on gear.