All-in isn't a good method to gamble. If it was worthy, people wouldn't have developed strategies such as Martingale, which are also pretty disastrous on long run, although much better than all-in on short run. If you use your entire bankroll to place a single bet, you won't have any means to continue gambling if you lose. It means you don't have a slight recovery chance, while by using other strategies you have at least some chance of making nice profit on the following bets.

All-in is just a desperate move by gamblers who don't know what to do anymore. Probably they have already lost so much money that only a single, heavy and accurate shot could bring them back to the game. Personally, I have never tried this method, but I confess I've already felt tempted to do when I faced harsh losses in gambling...