Speak for yourself. I use 2 laptops to dualbox. It's not that hard at all to switch between keyboards, as long as you use very structured and uniform macros. And actually, I just bought a 3rd laptop AND FFXI to go with it for Black Friday, so I will be triboxing as soon as the new laptop is updated. XD I will admit that to go much higher than 3box tho, it would most likely take some special hardware, and skills to use said hardware, while staying a "legit" multiboxer. My personal record was 6boxing in a diff game using 6x desktop computers stacked up 2x3 with 2x KVM switches (3x PCs to each) and 2x keyboards.... and I've seen crazier rigs than that w/ homebrewed foot pedal controls for the KVMs.
I'll have the new account from fresh > 1-3 119 jobs and in Dyna before New Years' if I actually put time/effort into doing so (and once I can stop doing VW when campaign ends in a couple days..)
Without merc'ing.