It's a simple 2-step process:

1. Slap a dynamic eq on the master bus followed by a maximizer/limiter
2. Tweak to taste. Use presets if necessary.

Instant "rough master" preview.

Benefits to this technique:

1. It's a great money saver.
2. It's a great time saver
3. More customer-tailored results
4. Gives less experienced users the opportunity to learn and practice.