[VenturyCap]

What happens when they take a cash advance and they lose their 0% introductory rate, then the cash advance rate kicks in at 20+%?

This is a serious question, if you have a way around this please let me know.

[abfunders]

What happens when they take a cash advance and they lose their 0% introductory rate, then the cash advance rate kicks in at 20+%?

This is a serious question, if you have a way around this please let me know.

It's called a "balance transfer." Do NOT use cash advances. Look it up online - every credit card can do it. The CLIENT just pays the 3% fee instead of the store, that's all.
Use one card with 0 fees on convenience checks, and balance transfer in and out from it, just like an ATM.
For cards with 0 APR on purchases, use it for purchases.
It's pretty simple.