Someone I know ran a “liquor gemach” where they collected 1/4 full bottles, left over from a simcha, and then combined same brands into half or 3/4 full bottles.
Then, turned around and handed them over to baalei simchas that could not afford to buy liquor on their own.
You’d be surprised, but it comes in handy more than you realize, as even someone who can afford to buy, sometimes needs a few 1/2 bottles to speed things along at a kiddush.
Plus, you’re always meeting / making happy people!