If I get to Vegas twice a year, I'm happy. I play for four days, not constantly, but for most of the day. It dawned on me that the relatively small number of hands I do play hardly provides a big enough sample for variance to achieve a fair reflection of my advantage. In short, I'm probably no different from the guy sitting next to me with a laminated card dictating basic strategy. It all comes down to luck when you play for a few days.
PS After four days, I was down about $700 at a $15 minimum table downtown. In about ten minutes at the craps table, I made it all up and more betting the pass and come lines and taking 4X odds.