Menagerie of google accounts

In general, do not say that I have something to complain about in Google. Entirely and fully functional I like.
The only thing I still can't do is keep it up: why are they pulling so much with merging accounts?

Having admired the idea of ​​Google Apps, I screwed mail to my two domains. And now for each I have a separate username and password. Besides, I have an account and gmail .com.

Why can not I configure access through one account to all subordinate domains, hell? Authentication system is one! And those can only be synonymous.