I'm not "addicted" to using vault vouchers. I tend to use my vault for basic storage instead of clumping chests on my residence.
I'm simply collecting all of the vault vouchers that I can for prices under 11k for sale at a later time. I was at 27 vaults, and the number irritated me, so I upgraded to 50, and it's still not enough.
I have 2, only because I accidentally activated one. (Only a $15K mistake, lol) I never really use it though, one is enough for me
Just like FWRonald, I have five, for at first the only reason being that is would be free Now that I have them, I noticed that even for moving stuff across the same server, it sometimes is really useful to have some!
I expanded mine due to a sudden outbreak of drop parties that seemed to all happen within hours of each other one week
i blame my friends ^.^ 1st it was "get 5 pages then u dont have 2 pay". Then i discovered promos and wanted 2 keep them safe. then i decided i should put my valuables in there too. then started playing on more servers and its easier to have all my stuff with me. so then i made pages 4 stone, clay, wood, glass, mob drops, auctions, mining, wool, food&flowers&dyes. think i got 17 pages now
I have 11, simply because I buy one whenever a miniboss drops a voucher and I don't have enough inv room.
I currently have 123 vaults and im going for 1000 (All on this account, not including the 5 vaults I have on each other account)
42 right now. I only "need" 5 or so, but I don't have a house or much personal storage, so the extra vaults let me be lazy. I haven't bought any from players yet, I just /expand if I need space for a pickup or use all the vault vouchers from mini bosses.