Thanks for the insider info. I'm curious why they don't put a hold on more money? While they do have the credit info, if there is not enough available balance left (the reason for the hold to begin with) how to they know they will get paid for what they want later, like gas, damages, etc? Or are they just taking the chance and hoping everyone's card will have more balance and hit it for that amount? Beyond that, aren't they subject to charge refusals because they didn't get authorization for the additional charge later? By stating to the customer that there is a hold (and getting their signature for it) the customer acknowledges the company may be owed more money.