I sell them at the local farmer's market. I had great success with oyster mushrooms but the competition kept driving down the prices and I could no longer afford to grow them at the price they sold at. I tried growing outdoors initially. I had some Morels but the deer ate them. My King Stropharia all got dug up by the chickens. So, I went exclusively to indoor growing.
So, now I'm growing ABM and Straw mushrooms. The ABM are real slow growers but the paddy straw mushrooms compensate by being real fast growers. Both like it hot so I keep a heater and humidifier in a 8x10 greenhouse in my basement. The greenhouse is pretty full now, so I may get another one and do some cooler temperature mushrooms.
Mushroom growing is not for the faint of heart. It can be real difficult to get the right spawn, substrate and temperature. But if you persist, eventually you get a knack for it.
Be careful about picking wild. Even the most experienced mushroom hunter can make a mistake. There are so many look alikes that are dangerous even Morel and paddy straw look alikes have fooled long time hunters.