I don't know. Part of the appeal of Tom Cruise doing it for real is that you know it's real. They emphasize that in the behind the scenes materials. The experience is vastly different to mostly-CGI movies like Marvel.
Yes, but I am sure Marvel made it up in volume. There are only so many Tom Cruises on bikes to go around, while Marvel is pumping out something every other week.
Yep. They absolutely could have done that stunt for much much cheaper by using a stand in. Tom Cruise does his own stunts because its marketing for the movie, and he enjoys it