On many cars it would interfere with the suspension or body fitment, short course and stadium truck is easy to put them up front though.
Doesn't make a difference for qualifying, for finals at large meetings aren't they supposed to have a camera taking photos of the line to verify which car was first? Not that this happens much I guess.

One downside is if you do a wheelstand over the line and it's in the front you might raise it high enough to not count