Quoted from exflexer:

Some games just play to long ie. CSI, LOTR, ST. Put a top 100 IFPA player on that game and the play can go on forever. That is one of the main reasons to increase the slope along with opening lanes. Increasing software difficulty more or less keeps scores lower not play time.

Quoted from ninjadoug:

We strive to set up games at Pinburgh so players all have a fair shot at playing them without them being too difficult.
With that said, we prepare over 250 different games for the tournament (most games used in any tournament) and sometimes the setups don't quite work out the way we envisioned them.
In regards to the pitch of some games, certain games play more difficult with a shallower pitch and certain games are harder with a steeper pitch. In specific regards to 24, some times 'A' players will just play forever no matter what you do to the game. It is what makes them elite players