In REAL life, you just don't meet people on the street that want to race from a dig. Most all of the races I have been in is when you are driving along on an interstate somewhere and someone pulls up on you and wants to mess around.
It's just opportunity....more races happen upon you when you are,,,well,,,,rolling. Sure, occasionally, you will happen to be at a stoplight and someone will want to race, but most often, it's when you are moving.
Nothing wrong with a roll race, just as there is nothing wrong with a dig race. Personally, I love racing from a roll, because the thought of dropping my clutch on a 4,000 rpm launch hurts my wallet just thinking about it, along with my not wanting to abuse my car like that.