Does the amount they let your account build up to before billing ever increase once you get to $500?
(it's just a curiosity question, I know it doesn't make any real differences)
Does the credit that Adwords extends you before billing ever increase over $500?
Typically $500.00 is the upper limit, woop01. If this is not working for you, though, please be certain to contact AdWords support from within your account, let them know, and tell them at what level you'd prefer to see it. They may be able to raise this for you.
AWA
We would love to see it go up to 5 or 10k or just monthly so the accouting dept doesn't have to try to make sense of 100K+ each month of $500.00 charges spread across multiple clients on the self serve accounts.
A very common wish. I think it's time for Google to look at the MCC and setting account spend limts at that level, and then have an option to use a client card or MCC card for each account.