Just a different point of view...
I remember vividly having a long conversation with a guy at Phillip Island one day about his dedicated track car vs just rocking up to the track like I did. He said the worst thing he ever did was to buy a dedicated track car as he said it became a job not a hobby. when he tracked his daily car, he'd do a quick check-up drive it to the track, go hard then go home.
When he bought a dedicated car, he said the whole game changed. He said he's always be modding it, so it needed a trailer, then it had to be prepared as he was always breaking down and needing repairs because he bought an old car (cost consideration) and heavily modded it for track.
Basically, he said he was addicted but it wasn't fun like it used to be when he just got into his car, drove to the track and had a blast for the day. It became too serious. He advised me unless I was going to get into racing, to just keep it simple and cheap and to only track my daily cars.
I took his advice and never spent too much on my cars and always bought cars in warranty that I could on-sell after a year or two.
I recently just bought a really low km manual e46 M3 with warranty from a BMW dealership purely for weekend driving and trackdays (my gf will drive it during the week as I don't want to rack up high k's on it and she works close to where we live)
For me this is perfect and I can be happy knowing that any problems associated with hard driving/track will be covered by BMW and not my savings.
my 2c