VMart pretended to have fouled a ball off his foot in a Nationally televised game against the Rays recently. On the next pitch he got a hit. The announcers laughed about it. Players have been doing it for years. To me it is no different than trying to sell a catch on a ball that you know you trapped or a tag that you know you didn't make. There's an old saying in baseball: "If you ain't cheatin, you ain't trying." Stealing a call is part of the game.
Here's an old story for you. In either 1969 or '70, Yaz hit a ball in the old Yankee Stadium to RF where the wall was low. Ron Woods ran back for the ball and jumped for it. The ball went into his glove and then he tumbled into the seats of an empty section. Their attendance used to be really bad. He knocked himself unconscious. Bobby Murcer ran over from CF to check on him. He was out cold and the ball was on the ground a few feet away. Yaz had already rounded the bases and was in the dugout. Murcer picked up the ball and put it in Woods' glove. When the ump came out and saw the ball in the glove, he called Yaz out. He was steamed.