@Mr_NutterButter A white market store can still accept Monero as long as they report it on their taxes. Monero isn't illegal (at least not in the US), but purchasing it is difficult. You need to buy Bitcoin and then exchange it for Monero. Stake-n-Shake could accept Monero while still being in the white market. The IRS doesn't really care about what the customers are doing, only the merchants.

Granted Monero still allows them to cheat on their taxes, but they could also cheat on their cash transactions, so it's a moot point.

But of course, Stake-N-Shake probably won't accept XMR anyway because of the difficulty purchasing Monero as I said earlier. It will only appeal to a small number of tech-savvy customers.