There are pluses and minuses to using your garage for pins. I have used my 2 car garage to house pins for the past 4 years and recently moved them out.

Plus:
space. I needed space and cars aren't that important to me, so outside they went and in came the pins. I also added area carpeting, a jukebox, lighting and fans. This was a bare minimum before guests came into the new "gameroom" since then it was more comfortable.

I've enjoyed wheeling games in and out. It was very simple and I've seen 2 dozen games go in and out of the garage gameroom in 4 years. I've had as many as 10 and as few as 4 in this space in this time.

Minus:
temperature. The summers are hot and the winters are cold here. Its not a problem in spring and fall, but its too hot in the summer (even with the fans on) and too cold in the winter to spend any time in the garage gameroom. Its insulated, but those garage doors are probably 10% efficiency if that. I could make it better, but that would mean more money to invest in this temp housing, which is not going to happen.

Unfortunately the temp has gotten on my nerves once and for all, so the games go back to the basement where its very comfy all year round. I have bilco doors to bring them down, so 10 steps up or down isn't too bad. Oh well, it was fun while it lasted.

Well, if you do that also check that you have amps on your electrical. I only had a 20 amp circuit for the whole garage and with the freezer and 4 pins I was maxed, so it could not handle another draw like a/c. The addition of another 20amps and separate ventilation would have been required which would have added cost to the project.