stinky - 9:23 am on Dec 30, 2009 (gmt 0)

I recently purchased 3 websites selling same product as my main site. I want to place my main site link someplace on home page of each of 3 sites.
Would this be considered spam to SE's? (3 sites are all registered and hosted different places)
This link would probably be placed someplace at page bottom of each site.
Any input is appreciated.