In the Dutch market, given the condition the computer is in, the offer of €200 you received is quite fair. To get a better price you need to remove the broken B: drive and make some filler for the open space. To get an even better price you have to ship it internationally (because demand is higher internationally but supply is limited). But doing so involves a lot of work for packing, these machines are highly susceptible to damage to the plastic front cover. It takes me 2 to 3 hours to pack an 8250 for shipping and a lot of packing materials that are also expensive (the bubblewrap I use for 8250 costs €70 per 50m).
I expected the value to be a little bit more, because of the new drive (belt-less), and monitor with good image quality.
Yes, an optimal price involves more work. Computer + monitor together makes a pretty large parcel.