How do you feel about optional paid entries?

I’m thinking about putting my LD entry on itch.io with an optional payment, as I’ve seen a few other devs do in the past. I was wondering what everyone here thinks about that practice: do you mind as long as the game is also available for free? Does anyone ever donate to these devs?
It would be the first revenue I’ve ever generated from a product of mine, so I’m eager to hear what you think.