Re: For about one in fifty ?
WP 10 Preview is fitting/working ok on my Lumia 635 with the typical 512MB RAM, and 3-4GB free internal storage. My issue is that it is still not ready to replace 8.1 on my 640, and I am not willing to allow forced updates (as with the PC version) when MS "thinks" they are ready/safe to use. That is an absolute show-stopper for any interest by me in Win 10 on any platform, and the privacy issues are nearly as critical, although it seems most can be turned off, leaving what about any modern system can glean from "metadata" type snooping.
Consider, too, that 1 in 50, or even in 100 is still still millions of users, so would those numbers not interest anyone for app sales??