The ability to use a TCV and store the residual value is relatively new; I believe it post-dates the experience of that poster.

As an FYI, if you want to link to a specific post, the #NN in the top right corner of that post is a direct link. If you link just to the page it may be a different page if someone has their preferences set to display a different number of posts per page.

Edit to add: I just found the thread that discusses the residual value bit; the policy took effect on November 12, 2007.

Also to add, I've only ever redeemed a TCV on a single ticket, but all mine have been low in value and not really worth more than one ticket anyways.