I would have to agree with the idiocy of some of the prices, especially the ones that are beat to hell or the ones that people think they should get what they put into them/what they would be worth in parts. However, with the type of 2nd/3rd gen Toyota's available, it is hard for the average seller to list theirs accordingly. $4500 is a bit high for a 2nd gen if it doesn't have clean straight sheet metal/interior/paint, and doesn't have a some mods like bumpers, larger tires. regeared, etc.
150k is considered low mileage for Toyota's, hell most consider them just broken in at 100k, especially if they were treated like an investment and not like a disposable commodity. If they have been maintained, 300k is about where they start to be considered high mileage.