NOT REWARDING POKECOINS

I have seriously been beating gyms today for hours just so I can put pokemons there and get pokecoins to get raid passes. The last 5 pokemons I have put in have been in gyms for at least 2-3 hours each! But come to find out when I check the store I have not received a single pokecoin. Whats the whole point of me spending this time on the game if Im not going to get my rewards and spend it on raid passes? Ridiculous

Hersheyx24 about Pokémon GO, v1.39.0