And a very good first question it is Stephen.
To answer your question; you would think so but unfortunately it doesn't work that way. There is a high probability that the person selling the equipment is doing so to raise cash for a subsequent purchase. And then there is the Just In Case Factor. The weather will certainly be a bit 'iffy' on and off for a while until the seller finally decides that they won't make that astronomy purchase. Which of course that means the weather will clear up, and the seller will suddenly change their mind and purchase that item, which of course brings more cloudy weather. (the actual moral of that story is don't sell anything astonomy related. Besides you might actually need it some time later

)
And of course there is the intensification factor. What if the seller sold to someone else living in the area.
It really is a no win situation except to shorten the misery and buy something just to get it over and done with.