I think it's because I'm in vegas and everyone is use to scam attempts. They don't want to hear anything you have to say because bitcoin "sounds too good to be true".
Free payment processing? Uh huh, what's the catch.
No hardware to purchase or maintain? No subscription fees?
No chargebacks? yea right.
Oh, AND you're going to set me up for free? Get the fuck out of here, scammer, I have a business to run.
Useless they're clueless, you're selling them repeat business. I suggest informing them that because of their fine establishment, you thought it best to approach them first with the near zero risk proposal, also informing them in almost the same breath that if they respectfully decline the offer, you're prepare to go to their direct competition with the exact same offer.