I've been doing this for about 5 years with classics. as an example. I've owned a mk1 reliant, ford consul, MGBGT, Ford anglia, Mg Midget, VW beetle,
the trick is finding the right car, and then putting a ticket on it, Its just a hobby for me, and you will never make tons of money but its fun and you get to own/drive lots of different cars,
if you have a few quid to spare and you are prepared to put the work in, then why not,
just have to be clear when selling it you are a private seller and you are selling the car as seen no warranty implied or given,