Often times companies/vendors don't find it worth it to pay legal to make these changes on edge cases, particularly if they have enough hungry people willing to work for them. There's also the worry that word will get around and more people will ask for exceptions (same or other).

So it is in fact easier and more cost effective to say "take it or leave it."

Not saying the clause is justified, because that was ridiculous, but it is interesting to get at the root of why they won't change it, and often pushing back consistently will get them to that point fairly quickly.