Making money in GTA Online has basically always been a game of whack-a-mole, with players finding the latest and greatest trick, and Rockstar promptly shutting the loophole down. With Grand Theft Auto 6 on the horizon, Rockstar has decided to nerf heists, which were one of the most popular ways to make a good buck in Los Santos.
The latest update added the Kortz Center heist where you're tasked with stealing an art collection. The first hurdle is that it costs at least $16.2 million to get a mansion and art studio upgrade you need to unlock it, and it only pays out a measly $2 million per completion for all your hard work—lower than most existing, easier-to-access heists. If you don't already have a mansion at least, it's not worth the investment.