anybody understands bing?

hi everyone. i think i am slowly finding what google and yahoo is about ... but what the fuck is wrong with this microsoft shit? if i make seo to some of my sites, first i see it in google, then in bing, then in yahoo ... in google it felt down after few days and then come back to some possition. if i am listed in yahoo, i am staying there for long time ... now, if i make it to bing, it tooks about 2-4 weeks, i am there for one or two weeks, and then my domain is totally deleted and i cannot see it, even after month or so ... it doesnt matter if its updated site or static, and it doesnt matter if i am doing more seo for the site or i dont touch it ... some sites are deleted, some are staying there ... but i totally dont understand why the fuck is that? it doesnt maky any sense, i think this shit is in beta and they are still working on it, or i really feel like in another space ... anybody knows why are your sites deleted? and please no "i have read", share your own experience if you have ... thanks in advance for any reply and wish you best with your sites!