All of the legit Bitcoin-to-cash orgs will report that to the IRS, and then you're back to square one: what do you do with that wad of cash? Orgs that don't report to the IRS probably aren't giving you a good exchange rate, and you're still left holding the bag afterward.
If you're going through all that hassle, it's much easier just to be a cash-only business in the first place.
If you're going through all that hassle, it's much easier just to be a cash-only business in the first place.