Right? I was like dang you're already half way there lol. The reason though is that they probably don't want to discourage payments because I have seen businesses refuse to use Monero in ransomware attacks because their insurance agreement complicates payout on a fundamentally untraceable currency. Even if Bitcoin is technically decentralized, they can report the transaction and specific currency blocks to whatever federal agency is responsible for fraud. Still, why not offer both and put a 5% discount on Monero.