I've had my minty HK94 for decades. I am largely a collector these days, so it's kind of a safe queen. I keep it as part of my collection, and as a reference piece. I've seen the prices go from $2200 up to about $5000, and then back down to $3200, what with all of the clones, and such. Like most collectors, I do not intend to ever sell it or modify it.
Honestly I own a 94 and it's the only one that I've seen in person. In my experience every gun show in my area is the same people peddling the same overpriced **** they bring every year. If I saw a zenith at a local show I think i would **** my pants.