Not worth the risk IMO.
You could buy an MX5 for less than a grand which would teach you how to drive, be just as fun and cost 10x less in the long run.
Then when you are done you will always sell it and get your money back, or if you bin it then you've lost a cheap car that you've had lots of fun in.
That's the way to go IMO, cheap MX5 and spare set of wheels and do a couple of track days, then buy a set of coilovers, then in a month or so's time a set of buckets and harnesses, another couple of months and a set of big brakes. Before you know it you have progressed from a cheap novice track day to competetive and competent with a great car.
Personally I wouldn't risk my daily driver; given the cost of something much better suited like an MX5.