I use a mule for a simple reason... more storage space. Anything I'm selling gets tossed on the mule, stuff I'm using I keep around, most of my money stays on that account, it's not like I lose money training so I don't run out often.
Easier to transfer items out of the store if it's a separate account anyway, just log on near the store, close it for a minute, trade items, open the store again. I don't use mushroom shops because I'm morally opposed to spending that much NX a month. I guess it's less relevant when you are willing to steal money from noobs, but I earn everything myself and paying an extra 200mil a month would put a dent in my profits.
Easier to transfer items out of the store if it's a separate account anyway, just log on near the store, close it for a minute, trade items, open the store again. I don't use mushroom shops because I'm morally opposed to spending that much NX a month. I guess it's less relevant when you are willing to steal money from noobs, but I earn everything myself and paying an extra 200mil a month would put a dent in my profits.