Don’t trust LL so never used it. However, knew a few girls that advertised on there, so I know there are at least some legitimate ads.
Guilty of some of the things you mentioned.

I would use it for same day bookings in particular because they are shunned by most Indys and nearly impossible at the most popular agencies. Even my regulars have to be booked well in advance.
If one of my regulars posts a same day availability, I would go for it if I was available. I’ve seen Indys that post on merb on their day’s availability. It’s very helpful to schedule in those cases. I never thought of using LL for that purpose, but looks like it works for you!