Hey aslan, couple suggestions:
1) Your previous post from you vegas trip was only like a day old, couldn't you have just replied to it?
2) I belive the $25 thing is standard MGM Mirage rating policy now. And when the PC says "average bet of $25", they really mean "minimum bet of $25". I actually had one floorlady come back and ask me for my card after my bets hit $100 at one table at Monte Carlo. Suggestions would be to either forget about the comp rating completely and go unrated, or to just say "yeah, sure", and bet $25 (or hell, even $100), then you're giving your card to the PC. Then go back to playing your game.
3) While at the Venetian, you may have made a mistake in deck measurement I like to call the "easy rhino"... I'm pretty sure all of Venetian's lower-limit tables (<$25) are 8D, not 6D. This could lead to you overestimating some positive counts. (My mistake was at MGM this spring, where I had them mistaken the other way around.)
This is a very good lesson to learn.
And I don't think "steamboating" is a real word, but I like it nontheless.