Guns are big business in the U.S.. And yet high controversal leading to eBay and many other on-line venues banning gun sales years ago, which leaves plenty of opportunity for others to sell those type of items.
And right now there's much fear, whether justified or not, that the current administration seeks to outlaw personal gun ownership.
Add to that the economic depression (yes, in the view of many it is; unemployment U6 is approaching 20% - google for more details about U3 and U6, which is more reflective of real unemployment) the U.S. is experiencing. Many people fear there will be more burglaries, robberies, and possibly even rioting mobs, as people get more desperate to survive.
Bottom line, in my view, is GunAuction.com sold for about what it should have; the seller did good while the buyer got a good, though not great, deal.
Seem like mouse.com went for very cheap, since it has many potential uses far beyond the computer field; easily brandable even for non-computer products / services. Keyboard.com is more limited, and $100K in today's economy, is probably about right; seller was likely lucky to even get that much.
Ron