It really comes down to what you want more, the radio, or the cash and extra space (which will inevitably be filled by another radio
). I don't think anybody but you can make that call... the only thing I can really say on the subject is that it's a lot easier to hold on to it than it is to get another one if you decide later that you really want it back.
From a logistical standpoint, I don't forsee the prices on those things dropping anytime soon... even if the '50s/'60s retro fad passes, it's still a very well built and very nice sounding radio, so it's likely to stay in pretty good demand.