I've seen it done. A guy in my old unit. Always passed P.T., but taped close. He didn't care too much because he was getting out. Some time later, he mentions that he's staying in for the full 20 years. Wondering why he changed his mind, I asked him. Turns out that his brother and brother's wife died in an accident. The brother and wife had 4 kids. With no one else for them to go to, he took them in. The kicker was that he and his wife already had 4 kids of their own.
So, with 8 kids, he decides to get the liposuction to stay well below on the tape. At this point the Army was downsizing and if you were too close to max on the tape, you couldn't re-up. There was no way he could afford to get put out with 8 kids and a wife to support. Poor dude, I hope he did OK.