I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
Don't waste your shots, for they'll push the gems closer to the hole and you don't want that.
If you can make a shot and grab a power-up, that's a much better course of action.
Think carefully before you equip the boost for your gem shooter.