I see that there are 5 options here:
(if you don't have that Lumia)
1) You get lucky, and give the prize to a friend who has such Lumia (these are premium cases, it counts as a birthday or other major gift, for real)
2) You participate, win and you keep the case in your memorabilia cabinet: First PF-thing there ever was!
3) You win, and for the heck of it, you get a Lumia!
4) You participate, as you know that some dude will pay good bucks for this stuff on EBay, for example (a very realistic view of the world here)
5) You don't participate and you join the celebration by other means! (leaving others bigger chance to win)
I might have missed out some. But of course we know, more superb designs from Eve+Mozo will come, this is the first stop.
These cases summarize best what the partners, Eve & Mozo, do best in general.