> Why?

Just because of statistic.

But actually, of course, it would be fair to make individual prices. E.g. there is a photo-camera for 7000, it makes very very good photos. Someone makes every day money with photos and buys it. Someone else wants also very good photos for non-professional private use, family and even for posts in WEB (without a fee, only donations). But this someone else must pay the same 7000.

Needless to say that in case of individual prices, additional rules and locks will apply.

BTW, some electronic devices are sold cheaper for academics (universities, students).