I agree that letting an opponent off their back and letting them up in a pin situation is unsportsmanlike but that is not so with getting multiple takedowns. As a wrestler who has been on both sides of this deal, i believe there's nothing wrong with it. My coaches will sometimes get on to you if you are matched with a greatly inferior opponent and you stick em fast. The main reason many wrestlers do this is to practice. They have no viable threat of losing the match so why waste an oppurtunity to get better. Now toying with an opponent when it really matters, such as regionals or state, or in a tournament when your team really needs points, its stupid to do. You do risk losing the match or getting hurt or something unordinary happening. And when somebody is playing with you it makes you wrestle harder and work harder so you are not embarrassed anymore.