It's Chris's (or James's, or whatever) thing, which is why people are complaining - they're right. It's the bankers' bonuses, though - only plurals' possessives get the dangling apostrophe, not singular nouns or names that simply end with an s.
However, "DVD's" or "DVDs" are both correct, but "DVDS" is definitely wrong.
There are languages which don't have the inflection for a numeric declension. I believe Chinese is one such - it's a highly uninflected language, so give cue about tense, number, and thing by context of speaker and order of word.
English isn't built like that; we have a relatively weakly inflected language, but we still have tense (quite a rich variety, though almost entirely built from a handful of conjugations), and numeric declension. We can, by deliberate effort, avoid declension, but I'd note that in the original post, despite Lee's best efforts, a few plurals and words inflected numerically (we, us, their) crept in. Lee could have avoided much of that by using "one", but that feels rather awkward to most people, unless you happen to be the Queen.
Worse are the plurals which don't take an 's' - two feet are a very different thing to two foot, for example.
Other languages are very heavily inflected - I've an odd feeling that Russian has 1, 2, and Many forms, for instance, and Basque seems to require that every speaker include the life story of their entire family in the verb endings.