Well, that's how some people play pen-and-paper D&D. Experience is awarded at the end of an adventure or at certain more quite "key point". But in a computer game that would take something away from the character building aspect that's crucial for a CRPG to work. Imagine only awarding experience once per act in BD... that would mean you would play an entire act with a fixed skill set and at a fixed level. From a roleplaying perspective this might be interesting but probably hard to get right in a computer game. You could of course split up the game into smaller bits than acts.

- Telemachos