SEO - Page Rank Query For Multiple Domains on Same Host

[infoaddicts]

Hi All..

Have query and deep concern on the page rank and overall ranking of pages of the blog. Have 2-3 wordpress blogs hosted on same webhosting account and been investing time and effort in getting backlinks for all these WP blog domains.

Will there be a problem in achieving a PR/SERP for these blogs ? Backlinking execrcise for one of the blog is aggressive while for others bit passive.

if main domain is www DOT ayayayay DOT com then any additional domain on same webhosting account becomes : addon1 DOT ayayayay DOT com, addon2 DOT ayayayay DOT com so on. (in control panel)

Your expert opinion/suggestiion is deeply appreciated as it would save my time / money / effort

Thanks in advance