You do not have to be a full-time real estate investor to do well in real estate investing. You can do this part-time, keep your job if you want, and make as much or more than you may be making in your full-time job! Why keep that full-time job then? Well, it is up to you. Do you get good medical benefits? Does your employer match or help you with funding your retirement? Do you get to travel in your job to places you may not otherwise be able to see?
There are a variety of reasons you may want to stay employed, but real estate investing can open new doors and give you options. See my video discussing flipping houses and multi-families and knowing the cost in buying and holding before you decide to flip or hold that rental property.