> To be fair, a million requests per month is 20 requests per minute...

Which, in B2B, is insanely profitable. At 20 rqsts/min, for a paying customer paying you $200/m/user, those numbers are fantastic!

I can only dream of having those numbers!

Sure, but in terms of load, dealing with the requests, a single raspberry pi 2 will barely register that even if you deploy it with a CGI stack.