That's not quite correct jorim.
1. The buyout value is not set in stone like that. The seller himself choses the amount he wants to get paid and he can ask for as much as 15000 stars. That is 400€ when bought wit paypal donations. The
minimal buyout value for a level 60 on Kronos is as you said ~10€. (
https://www.twinstar.cz/manager/Auction/Manual.aspx#buyout_table)
2. The price of characters is pretty much dictated by the market. For example, right now, on the Cataclysm realm, which is by far the most populated, you can buy a level 85 horde warrior for 800-3350 stars(21€-89€). There are 17 such warriors there and the individual prices vary depending on their equipment/professions/achievements, with every new seller inspecting those characters and setting their price according to the competition. Then, you look at level 85 horde druids, and there's no competition. Nobody is selling druids, but one guy. At 7000 stars(187€).
Edit:
I would say that the thing which will have the biggest impact on the amount of characters for sale, apart from stars being quite useless to a Kronos player, is going to be the absence of an armory. When there is no armory you can't advertise/prove what you're selling and you can't see what you're buying. When I want to sell a character, with such and such equip and a certain time spent on acquiring it, I want to set the price accordingly. But when a buyer sees that character in auction, until the armory is finished, all he sees is a name and race. For all he knows the character could be naked, without gold, without professions, without riding or a mount even. And he's likely not risking paying my steep price for it.