$.25 psychology; Perhaps a diversion to distract from problems within? Messing with motorcycles (or indiscriminant sex, eating, gambling- whatever) is something you feel like you can control and deal with- as opposed to what scares the beans out of you.
Not a fun idea, and I'm probably projecting here. Mostly because of financial necessity, I'm down to 3 bikes now. I have an inner rumbling of rapacity that I still deal with, but simplifying things some has been rather freeing, too. Not as much maintenance, and fewer niggling bills like reg, insurance, taxes, maintenance items, etc.