So GTA V is getting a new heist. That's really cool, but my guess is that it's not going to be worth it in terms of making money. The last heists had a ridiculous up front cost since you had to buy the bunker and than the setups were a chore.
Than there's GTA Online's garbage matchmaking and lobby system that guarantees that you will almost never finish a longer heist on first try no matter how good you are.