I haven't even spent a dime on Pokemon Go and I play it daily.
So since you are so fond of it, would you like to see MORE of it, or LESS?
Would you like to see it improved at all?
By not spending any money, you are in effect saying "This game I really love, I sure hope they never improve it or keep up with system updates! Maybe someday it will be so behind I'll have to stop playing!".
I also really liked PokemonGo. I was fine not paying for anything myself, I never felt the need to - but I still spent $5 or so on Pokecoins just to support the company, to say "Thanks for the enjoyment I've had playing this game".
My Philosophy is simple, if I see something I really like I try to support the creators by any means possible.