Some jobs pay a lot maybe even up to 2,500 a month (some college degree jobs). But you spend countless hours of your life you could use to build up your project. You could get a job at mickey D's or washing dishes for some quick cash but then again more time. So what is time worth to you? Of course some time spent at a real job is a good learning experience but if your young days are past then what's a better use of your time? Hours devoted to your project can pay off though not right way.
Depends on what your priorities are.. If you want to lead a life free from 9-5 then you can work on your sites and scale up your business so that you can quit your job ... However it requires a lot of hard work and risk taking but the rewards are definitely worth it... Regards,