Was it really Model M or Model F keyboards, and did you sell them for a reasonable price?
Too often on eBay I see sellers trying to sell some vintage but crap rubber dome keyboard for much more than it is worth. I recon that they must have seen some real collectors' item sell for a lot and not recognised what made that one more special.
And yes, different markets are different and prices fluctuate. In the US, the going price was around $30 for a regular Model M a few years ago, but over here in Sweden the going price has been up to $180 recently.