If you have a scratch to itch then why not   I can see the advantage of driving lots of different cars at a minimum cost...i.e not buying each one and having to maintain them. 
  
I guess if you have that much money to spare over 1 year then why not....... if it was me then I would rather put it towards something I could own over a few years. 
  
My boss know some one who was a member of a club owned by a ex F1 driver.... he had a 911 Turbo for the weekend, took his mate out for a drive   . when they got back they decided to go to the pub for a drink, he left the keys on the side, the Mates nipper came home, seeing a flash car in the drive decided to take said vehicle for a spin round the block. I guess you know what's coming....... 
  
....... an accident occurs, nipper does a runner, insurance company wont pay out, bloke has to pay the list price to replace the 911 + compensation....= just under 250K 
  
I know he's a nob for leaving the keys on the side and for having a mate who has a son who would  "test drive it" with out permission   (I believe it was in the news a few years back) 
  
If you do join.... read the small print VERY carefully and don't take the keys out of your pocket