Although I think there are some realistic points made above, I think the answer depends on how good you are and how much you need to live.
I have a ROI of 50% (all from sngs), so it isnt impossible (admittedly at the $1 45 player sngs)
If you could win some cash and clear bonuses at the same time then $5 level might be just about achievable, but you would want to aim to move up levels until you're not just playing to survive.
I'd set yourself a target (min to survive) and then once reached play to make enough to enter the big mtts - you would need a 'safety cushion' though
Agree you'd be better off working until you know for a fact you can do it (even a bar job so you can earn enough to scrape by and hopefully get some free food thrown in)
I tried playing
freerolls for a living for a month a few years ago- didnt work lol (almost made enough for rent mind you)