Currently working in asset management and the trading rules are a killer. I used to trade options on equity indexes and commodities. These were the only derivative products I could trade short term (less than 30 days w/ profit). It would have been very beneficial to not have to deal with tons of overhead of talking with compliance every week about what each security was because it wasn't in the database.
Even when buying individual equities I would get emails indicating my trades were flagged for further analysis. It isn't enjoyable to be good at managing money but unable to do so without fear of punishment.
Even though I follow the rules, the process made it too difficult to manage. It is a real opportunity cost because in order to invest aggressively I would have to quit.