Given that you know nothing about where I work or the nature of my work, that's a strange assumption to make. Not everyone is writing public-facing web apps designed for IE5 and up.
Ok fine, so you write inward-facing web apps designed for Chromium 7 and below. Still I feel sorry for the the poor chap having to maintain your library which, you mentioned before, served mostly so that you could learn Javascript better rather than what should've been a driving factor when making the decision - the business case.
I maintain the library! I work for such a small organisation, and this library is deployed on such a tiny web app, that the fact it wasn't built using JQuery or whatever is utterly inconsequential.