@James *******
There have been no credible stories of people being asked to prove they still have the $$ in the bank. If you decide to try to extend, instead of leaving to reset your 180 days, you will basically have to reapply. That means resubmitting all of the paperwork and financial proof you did from the beginning. Immigration doesn't like doing DTV extensions and will tell you to just leave and come back to get a new 180.