The comment you make regarding the iBook G4 is interesting, "that'll most likely never sell".
Obviously it depends to a large extent on the condition, and on the local/national market, but in extremely good condition it didn't strike me as being ridiculously priced. I say that just by looking at the national market here in France. There are many iBook's on offer of similar spec to the one you show at $175.
These are just a few I've just found listed, all private sales:
180€ ($203); 190€ ($214); Two at 200€ each ($226); 210€ ($237); 230€ ($260). There are others from 60€ ($68) but not in particularly good condition.
Oh, and I've left the 'best' for last. Comes with an OS Tiger manual (not the DVD), power lead slightly damaged, and (as always) a dead battery. At least the seller did have the decency to say that he will except close offers!
The price? A cool 350€ ($395). That makes the one you indicate quite a 'bargain'..........
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