I used to encourage my son to do this for the same reasons MRGRAPPLER noted. It's seemed like a waste of time to go to a tournament and mow through everyone quickly. That said; I don't let my son do it anymore. There isn't any quality mat time by taking a kid down and letting him up 6 times before you finish him. In the end it humiliates the opponent, pisses off the refs and just isn't a good look. I think there is more dignity in finishing off a lesser opponent quickly than making him look bad in front of his family and friends. I'm not going to judge anyone for doing it but I can't, in good conscience, justify this practice for more mat time. Spend more time at practice if you want mat time or go to tougher tournaments.
Nathan, I agree with you, always have and always will. Who cares how much time you spend on the mat in a tournament? Your job is to try to win, compete the best you can, wrestle as hard as you can, and when the opportunity presents itself, pin your opponent. Practice is for practice, tournaments are for doing the best you can and if that means pinning your opponent in the first period, that is what you should do.
