Depends on your perspective and mentality. When you trade your own money, you many not make that much starting out, but as you build the account up and become consistently profitable there is nothing better than getting 100% of what you make and only paying 20% Federal taxes on it. You also never have to report to anyone, never have to worry about job security, or worry about some other rogue profit center blowing out the firm you work for. Not to mention having to share or give up the IP or strategy you created to the firm who hired you, question your discretionary bonus (which is never enough), or deal with the stupid non-compete clause if you ever decide to abruptly leave.
Sure, when working for a big prop group, hedge fund or bank, the cushy draw/salary, structured environment, nice benefits, no downside risk, no money you need to put up, and unlimited capital to trade with is a nice privilege and existence with much less stress, and as close to a free lunch as you can get. But in the end you are just another employee that may have to kiss someone's ass to try and get ahead, with always the possiblity of getting fired without warning,
It takes brass balls, chutzpah, and supreme confidence to back yourself and build your own trading empire. And in the end it's totally worth it because you can make your own hours, keep your IP, call all the shots, keep everything you make, and never have to answer to anybody.