I have thought about practicing just a QofH sidecount at home, to prep for something like that. I don't have any experience with sidecounts, but with so many near me I have thought about trying to get that down.
You can bet quite a bit on the LL sidebet, I don't remember the limit, it's less than the table limit, but I've seen people bet green on it many times. I never understand why people on bet the $1, must be for fun. I've put red on it the few times I've seen the count go really high. I think I hit one at 4to1, not much and never anything big like something suited or pairs.
I'll give it to the casinos, it's a great sidebet, people eat it up by me. I've actually seen people standing behind a full LL table harassing people who are sitting and not playing the LL sidebet. They think they should be at another table, and let people who will play the sidebet sit down. It's ridiculous.