It's a judgement call on high you should push your bet, depending on things like heat of course.
Had a good run, where I had my bet significantly above 15 units, and was severely tempted to push it much higher. But noticed the floor person hovering around my table like a buzzard. Not direct heat, like glaring at the table, but someone starting to take note (I think we all know the move). So I didn't push it.
And as Flash mentioned, its also better for variance not to make too huge of a bet. Guess I'm sometimes a variance chicken too. :laugh: