Used to be when you made the magic miminum tier points (15,000 right now), Diamond Lounge access was part of the deal. Now you must have 25,000 tier points to eat/drink free, or you pay $10.
I didn't know one could pay for DL access without having earned Diamond at all, so that is a question. I didn't think so.
For Diamond under 25K it could be worth $10. There are very limited number of food items, not like a regular buffet. Some have a few hot food items, maybe some meat balls or wings or something, plus some cold salads, etc. Some have mainly salads like chicken salad, fruit, at least one hot soup, chips and dips, cookies. But with unlimited food (tiny plates!) and cocktails it can be a pretty good value. Just don't go expecting gourmet food and top shelf liquor.
Convenience is a factor. Gambling and/or stayi8ng where there is a DL and you get hungry, not in for a big gourmet experience, the $10 can be a reasonable play.
Never heard of Laurel Lounge.