To the best of my knowledge it's money. The best way to increase your pr is with inbound links - i.e. on your customers sites.

I never like google ads on a company web site - "if they're so hard up they need google ads to make money then they can't be very good..."

Don't take that personally tho...

Other than that I...

If I knew what a broken horse was I might be able to offer more of an inciteful comment, ;) but for a professional (sort of) opinion I'd say your menu needs to be some other color than default...