None of those components are noteworthy, they are entry-level at best, and given their age they would not sell for much at all. It may be worth it to purchase the bicycle if you could use the parts to repair something of yours, but there won't be much profit in parting out an older, lower end bike's components.

Joytech supposedly does make some better hubs, but from my experience as a bike mechanic, their primary market is in the low end department/sporting goods market.

Shimano 100GS is pretty much an old equivalency for what is now Tourney, which is just about bottom of the barrel.

The Alivio derailleur is an entry level component. And given the age of the 100GS components, chances are its probably an older model itself.

Its not worth your time unless there's something on the bike you need.