This number doesn't really have that much significance. Obviously every bitcoin user is going to rush and make an order the first day to test out the system (or inflate the numbers). But what does it say about sales over a whole year? Or how many new users it'll attract?
??
No one has made that claim.
It's initial sales data from right after they started accepting a niche new payment system with lots of fanboys. I think most people realize that $124,000 in 21 hours says little about long-term effect.
But Amagi Metals isn't complaining and they've been accepting for over a year IIRC. There isn't exactly a slew of companies CANCELLING their bitpay accounts so I think that says enough to satisfy your concerns ;-) No one's forcing them to do it so a reasonable assumption is that it remains profitable.