How many VMU's do you really need? How many do you have?

[/dreamcast]

I picked up my first Dreamcast a month ago at a Retro Convention (Renton City Retro, woot!). Console, controller, Rf adapter, and power cord= $45. Picked up a couple of games and a vmu at the show as well.
it is 3 weeks later, i now have 5 Vmu and 7 other memory cards, a second DC, 3 official controllers, Pound cable, Hyperkin cable, brook ps3/ps4 -> Dreamcast controller converter (i'm using a Hitbox for the fighitng games specifically) and several games.
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But VMU's i find fascinating and want more is there a limit? Curious how many do you peeps have?
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Also when one DC goes down i'll be heading gdemu route. Until then playing games and having fun. i