The best quote I've heard...
...on the subject:
"The only people who split tens are idiots...and idiot savants."
Though splitting tens is a very valuable strategy deviation, this is almost always negated by the heat it generates. Even if a PC isn't near you when you make the play, the complaints and groaning of ploppies will assuredly call attention to your action. This play is best left for the better "actors", who are known to the pit as "wild" or "crazy" gamblers. I should point out that there are some places where ploppies do split tens more than usual, and this would obviously allow you to blend in much easier. All in all, its probably best avoided. Comfort yourself with the fact that splitting tens increases variance, which would offset some of the ev gain anyway.
ANS