How would it benefit the server:
Bank heists would be a gta/payday style minigame where you would be transported to a special area and try to rob things while either killing or sneaking by enemies. You would have to pay money for the equipment on that heist and would not be able to use it from your inv (equipment meaning vehicles, weapons, etc). There could be several different payday style jobs that you could do so it wouldn’t get stale. You could have different style masks like in payday 2 that you could buy or get styles of! Heists would have a cool down so that it couldn’t be farmed.
Potential Issues/Exploits: it would take a LOT of work and coding, but it would be (in my opinion) the most content filled thing to do on the server
Additional notes: this would take a lot of effort, but if it’s completed it could be the best thing on the server