Fortune 500 company site link purchased in My Directory and site.

Well, I have several web directories and running Text Link Ads.  Recently, BofA bought a link from my directory and T-Mobile bought a text link ad on one of my site.  Of course, they hired SEO Firm, but why do they need SEO for their site?.  Wondering how much they paying these guys to go around buy some text links?  Anyway, it feels good because I have Fortune 500 company link in my directory.