As EGBK says, for CPL a some of the time needs to be in a complex - ie retractable undercarriage, and variable prop. That doesn't preclude share ownership though - two of the guys on my groundschool course have bought into a Rockwell Commander 112 - which not only lets them do all their CPL, but a good chunk of their IR. Your clearly doing ATPL modular, so at least 5 hours of your training needs to be in a complex type. In reality, you want a bit more so you are totally comfortable with the aircraft before your skills test.
If you do your calculations right, it can reduce the cost of your ATPL training, although not by much. It does give lots of other benfits, as previosuly mentioned, though for when you just want to have fun! In fact, in the depths of ATPL theory I have found it essential to just jump in and go sometimes!
Ghengis is correct in saying some syndicates don't want hour builders, but conversely, some do - if the aircraft isn't flying it's costing a ot of money in star annuals etc, so there is a healthy balance to be struck. Plus, hopefully if you are serious about your career, your flying should be excellent, and therefore minimise any risk to the aircraft.
Again, as Ghengis said, I can take my wife, plus my best mate and his wife to L2K or Oostende (but go to Brugges) for less than £260 return - that's Easy / Ryanair territory - but far cooler! (unless one of needs the loo half way across - in which case you really do need to be good friends - and flexible!!!)