I think the Lucky feat is kind of bland, honestly, compared to all of the other more interesting choices out there. So I give it to all of the characters for free.
Well, sort of.
If a player brings enough snacks to share with everyone, they get 1 Luck Point to use at any time during the gaming session. If they bring enough beverages to share with everyone, they get 1 more. And if they are the brave soul who has agreed to host the gaming session in their own home, often at great inconvenience to their wives and children, that player can get 1 Luck Point more.
These points don't regenerate after a long rest, though. They last for as long as the gaming session does, or until used. At the end of the gaming session, any unused Luck Points are converted to bonus XP. I know that the "per long rest" part of the Lucky feat is the reason everyone thinks this feat is the Bee's Knees, but getting it as a reward for good sportsmanship seems like a fair trade in my gaming group.