Replying to MVMT Sparks? + ROI on gear?

Hey guys

I went to the shop the other day, and looked at Movement Sparks. They looked really hot (here's a pic - not mine: http://farm3.static.flickr.com/2009/2365019690_151e39d881.jpg?v=0 ) and shop owner was enthousiastic about them, so I figured to see what the thoughts on these ski's are.

I've also got another question. When I bought my last pair of ski's, regular Volkl piste ski's which were about 200€ (new but 2-3 seasons old) it was clear that it was a good buy, cause when abroad renting ski's is damn expensive. But seeing these Movement ski's at 570€ (with bindings though) it got me wondering what the "return on investment" so to speak is on buying gear. Renting them in the same shot is about 60€ if I recall for 1 week - do you really save money buying ski's? And then theres maintenance cost etc etc... How long does it take to get ur money back, and do you get it back at all? Whats the advantage of buying them as opposed to being able to rent the same ski of your preference which has been used 4 weeks tops in the shop?