People who use these things may "get away with it," but pardon me for sounding like a goody-two-shoes when I say that they are honestly cheating themselves. The grades you get in college (or high school) are worthless if you haven't learned anything.
I am a math tutor, and I tell kids all the time that they will learn FAR MORE from a problem that they wrestle with and get wrong than an easy one that they get right.
One of the most important things I ever read about the process of learning is that we DON'T learn from our experience, we learn from REFLECTING on our experience. This is true in every area of life, whether it's academic stuff or relationships.
Hence: Bought term paper, no experience on which to reflect; thus no learning.