I bought V2.3 a couple of months ago, and at that time my understanding was that minor revisions (V2.4, 2.5 etc) would be free but that major ones (V3, V4, etc) would cost money. I seem to remember reading this on their site at the time of purchase but I didn't print it out and I have no idea if the site still says this or not.
I did upgrade to V2.4 for free, as I expected, and was not surprised to see that V3.0 would cost me an upgrade fee ($50-$60 or so, I think) but I haven't upgraded yet as I am in the middle of working a group of photos and don't want to change anything right now.
My experience does not address your "Charter Member" issue, of course. I know nothing about it, except that I saw it mentioned on the old version of their web site but didn't read it myself since it did not apply to my case.