Really? Based on what exactly? What something is worth is a debatable thing I guess and in the end, what something is worth really comes down to what someone else is willing to pay for it. That said...
Set #1 is a KRA 4114\4107 combo. New they go for $3700 so the $1k asking price is 73% off of MSRP. Depending on condition that seems pretty fair to me? Lets it put it this way, I just bought the same setup in Royal Blue for the same amount and I feel like it was a fair price. Let me also put it another way... find me that same setup in the same condition for less. I have been seriously looking at SO boxes for over a year now and haven't found a better deal then that.
Box #2 - Looks like a KRL series? Assuming it is and depending on condition, that could be a smoking deal but I will admit the condition looks rough? $800 may just be fair in this case unless it's in really awful condition?
Set #3 looks to be the same as set #1 just in a different color. That being the case I would agree that the asking price is way to high