Yes the XT Model F is going for around $60-80 currently. They do require a Soarer's converter to work on modern PCs.
The AT Model F is currently going for around $200, in excellent condition.
122-key Model F are going for around $185, in excellent condition.
I have not studied the "Completed Listings" which are where you really go to see ebay prices, but I will say that your prices look perhaps a little high for the small ones.
The other side of the story is that there are always multiple XTs listed (albeit often at too-high prices) while ATs are more scarce and fleeting, and F-122s are downright rare.
That one F-122 listed by h2gofast has been sitting there all alone for several weeks, and, frankly, I am surprised that nobody has picked it off. Furthermore, I predict that after it sells, it will be at least a month or 2 before another one turns up, maybe much longer.