A lot of the relatively common old MTB wheel sets have good value. Think anything with 26x1.75 dimpled Araya rims.
As far as saving hubs, I use the bolt cutter method, can save a set of hubs in about two minutes. Even so so hubs can supply cones.
Suntour and Specialized both had cartridge bearing hubs.
The "problem" with selling wheels is the shipping. It costs me as much to ship a pair of wheels as it costs to ship a frameset. Meanwhile, a pair of hubs can fit in a flat rated padded envelope~$9.50 postage.
+10 Some freewheels and cassettes can have good value too, depending on condition. Uniglide cassettes, Helicomatic to name just a couple.
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Please don't confuse ebay "asking" prices with "selling" prices. Many sellers never get their ask price. some are far from it. Value is determined once an item actually SELLS. Its easy enough to check SOLD prices.