I try but the spoofers have disrupted that. They also all have Snorlaxes and Blisseys so the gyms are hard to take down. Took one down the other day and list it again, but not to the same guys so that is ok.that is cool, the key is to get high up on a stable gym in your area
My area is dominated by Valour and Instinct. I'm Mystic.
I find the best to be when we took out of town trips, get on gyms there and they usually last long. About 4 of my current gyms are 1 and 1/2 hours away. Had 11 but they slowly took those down.
Anyway I'll see how I maintain this game with some recent changes in life.
It'll probably die out.