First and foremost... FHM.. BAD! BAD! VERY bad!!! lol..
Now, as for Vegas... there are some VERY cheap seafood buffets all over town... Which has always been a matter of concern for me. How the hell do you get the BEST CRAB LEGS IN THE USA in the middle of the bloody desert for $2.99 ???! That's dodgy.
I recommend you lend your mother your AMEX and let her have some fun! She IS your mother afterall!
(Actually, I did have a surprisingly excellent steak at Terribles once, quite by accident... and it wasn't very expensive by typical Vegas-strip standards.)
(..and if they leave the strip, it's just the same as any other US suburb really, but that will unquestionably take the 'fantasy' out of the whole experience!)