Do tax professionals have to pay the e-filing fee if the return is over the threshold amount?

I was wondering also what tax software most CPA's use?

Answer:
What e-filing fee are you talking about? Most software has some kind of fee. Individual software sometimes has a fee for each efile. Licensing rules for software like Turbo Tax prohibits its use for multiple returns by professional preparers.

I use software called TaxWise. It's one of the professional ones, but there are others.