How the Professor plays
On the come-out, the Professor bets the Pass Line.
Once a point is set, he takes max Odds behind it, then buys the 4 and the 10 (unless one of them is the point). A Buy bet pays true odds, 2 to 1 on the 4 and 10, less a 5% commission when it wins.
Why people like it
It’s the homework answer. Placing the 4 or 10 pays 9 to 5 and costs 6.67%. Buying them pays 2 to 1 for the commission, which works out to 1.67%. Same numbers, better price.
The catch
The 4 and 10 are the hardest point numbers to hit: three ways each, against six ways for the 7. Buying them makes them cheaper, not likelier.