That kind of mark up is a wine crime! Your rant is fully justified!
I'm usually OK out to 100% mark up, then I sign off.
Vegas is actually a pretty bad wine/restaurant town because there are so many people who come here and throw money at wine just to say they had a 600 dollar bottle that the mark ups tend toward gouging.
Seeing a 100 dollar bottle of Clos Du Bois merlot on a wine list is a bad sign. :)