Quote Originally Posted by ally66 View Post
Do I understand correctly that the best way to spend gems is to buy an extra spin, for a chance to get a multiplier?

Or are there better ways to spend them?
I never did that. I used gems to double shares, which immediately went into the key drop and private show spawn reduction decorations. More shows equals more keys, which mean more chances to get gem drops. I then used excess gems to buy guaranteed multipliers from the shop if I felt I needed them, which wasn't often. If I got a multiplier from the free spin, then great. If not, I never spent gems to try and gamble for one.