Add up how much the bank tabs cost, (you can add 10-15% on if you want to give room for haggling) Take each level and multiply each one by 100. Add that up and then look at the amount of xp it will take to get to level 14 and give a reasonable discount if you just hit 13 if you're close to 14 multiply that by 50 and add it in.
Throw it all together and add in cost if you're leaving "USEFUL" items or high-value items in the bank. Any special cheeves? add in for that.
Last edited by Shaefaerie; 2011-12-04 at 04:27 PM.
I've purchased a level 24 guild for 30k and a level level 25 guild for 50k. 149 and 530 members respectively (lvl 25 guild was a bargain for that many members but the guy was quitting and wanting to sell his gold to a gold seller so wanted a quick sale)
a level 13 guild would honestly depend on the amount of active members you have
if it had the member cap with everyone active < month then I'd pay 100k for it, but if it's only got 1-15 I'd pay 3k for it
if it had an active raid, dungeon and/or RBG team I'd probably pay 10k for it as it's a risk