Expensive?
That could be very expensive. Until you find the correct set for your style of throw, you would have to roll hundreds, maybe thousands of times before you recognize a pattern. I've played craps for a few years now, and it was just by coincidence that I started using the two-3 set. It took quite some time to catch the pattern that five came out more than seven. So, I capitalize on it. Nothing fancy, magical or mathematical, just catching the (lucky) percentages. Other people use the same set and don't roll the same numbers I do. Throw technique my be different, whatever, but I'm sure they know their own tendencies, and bet accordingly.
On the matter of throwing more sevens on the come out roll for winners...I set the dice on seven (five and two) and roll quite a few sevens (six and one). Not enough to call it a pattern.
One of the problems with being consistent is you always have to throw FROM the same spot, TO the same spot, the exact same way, with the same rotation, landing, and final roll or bounce. Another problem is that all tables are not created equal. The cushion underneath is different on some tables, so die bounce more in one casino than another. Some casinos have longer tables. The rails are higher in one casino than another (this makes short shooters stand on tip toes and have to reach or stretch).
Some earlier comments were made about players being tapped out. To address this issue I have actually seen this happen... Player was setting the dice and was using his technique for throwing and was winning quite a bit along with everyone on the table during his rolls. If the dice are not moving the casinos are not making money. This is the same as if the dealer is too slow, not as many hands per hour, equals less money for the casino. The box-man and the stick-man informed the shooter he was taking too much time and would have to shoot without taking the time to set up. "We give you the dice, you shoot! If you don't like it, pass the dice to the next shooter and you are welcome to keep on betting." This removed any advantage this shooter was giving to everyone on that table. Unfortunate, but it happens.