The Real Saxman,
Thanks for your post.
1. Before phone extensions (and even now), we'd do this, for no other reason that it's just another kw-rich url, and it's good marketing. Lots of people search by toll-free number / phone numbers, and it's a great way to attact new biz...and just makes it easier for people to find you.
2. IMHO, I don't think it's spammy-looking. I think it's just good advertising/marketing. Your user, if totally lost, can always find your toll-free number, that's for sure. :)
Hope my answers helped in some way.