Buying merchandise doesn't make me a customer? Oooook..
I don't live in the US either and I bought an Ed Reed jersey, a towel, a football, a winter and a summer hat ( I'm sure I'm even missing something). I bought my gf a Torrey Smith jersey and 2 South Carolina sweathers while taking my sister a USC summer shirt.
Also, even leaving merchandising behind, what you wrote about revenues makes no sense. Ever heard of NFL game pass international?
The league plan to bring more and more games abroad is definitely a huge help to the increase of the fanbase (who go to the games, pay a flight, hotel and tickets) and therefore its revenues. I'm sure you're one of those americans who keep advocating for the game being played in the US only because "hey, it's OUR sport...make your own dang league!".