Reason 2: No, but in all seriousness: Taboo and apl.de.ap have gotten really, really tired of taking will.i.am's ridiculous concert costumes to the dry cleaners every night.
Yeah, we could basically make five jokes about Tab and apl and call it a day for this list if we really wanted to. But, we're still not over this. How exactly does this work? Do Tab and apl get the same cut as will and Fergie? Do they see the same kind of show money as will and Fergie? Do they have body-doubles who show up and stand in the background for $100 when they're not feeling well? Hmmm, we wonder.