I guess, paying $200/wk renting to drive for Uber in a new car is better than $400/wk with the raggedy cab & then be penalized for not checking oils & fluids every day.
I've heard that driving for both Uber & Lyft & maximizing profits, people have quickly developed enough money to go & buy their own car. Not sure how true that is.
I think it all depends on location, how many hours you drive, when you drive those hours and where you make your hunting grounds.
There are people who can make Uber/Lyft really work for them (like in the San Francisco, L.A. and NYC markets that pay a greater base/per mile/per minute rate than here) and others who really have to hustle to make it profitable. You need to make sure you are looking at what local drivers are saying (and determine if they are being truthful or not), not drivers from other cities.
To give you an idea, I do this as a side to supplement my real (poor) income. Depending on the week, I may put in 15 hours or 25 hours...I haven't done more as of this time. My lowest gross has been 250/wk, my highest was this past week with New Year's Eve...$750. My highest gross before that was Thanksgiving week, when I grossed $470.
My overall average gross (since I started) is $20/hr.
Note that I am quoting gross, not net. This is what I have made with Uber/Lyft before factoring any expenses, including gasoline.
I wish you luck in your decision, and hope the best for you in 2018.