When you say "real time shipment tracking: yes (above $50 purchase)" do you mean the seller will be forced to send via a trackable shipping method only in that case, or will users be able to pay extra for adding a tracking number?
They might enforce it, I wouldn't want someone to send me a tablet pc for instance via non-tracked post. Look at companies like Amazon, you can spend like £5 and get real time tracking and GPS of where your goods are, I imagine it'll be the same.
Oh really? I did not know that this possibility already exists. For some products that would be worth considering. But actually it's more of a curiosity, because the packages should actually be insured anyway, and if they disappear on the way to you, that's usually a problem for the seller. From this point of view, the seller might have been more interested than the buyer :-)