Cause I like to
BREAK NEW THINGS!!
Heh-hehheh
Well to be honest, it's that and a combination of what others are already saying. If we as "Helpers" want to be able to stay current, we have to get the newest ASAP and get into all the little nooks and cranny's it has to see what new nooks and cranny's it has to get into (am I speeking in circles here?)
Plus I've been beta testing stuff since early last decade so why stop there, especially when it's Free and the darn thing works!!
Although I am having more issues with 7057 than any other build so far, I also know it's an Internal build and not destined for everyday use like 7000 was, and I still want to see where they're going with things. Personally, I don't like the new Control Panel icon, it looks flat and dull. I think they could've made more use of the older icon but make it more translucent looking and maybe more detail. This new one looks like something a new icon developer would put out in a trial pack or something.