In general, and at the bottom line, people sell their characters by the price they want, and they might have reasons to do firesales. Those I understand. If you are aware of some aspects of it before you sell, you are free to sell your product however you choose. As Adam Smith says, the boy only sell newspaper for a penny because that penny worth more to the boy than the newspaper, and the buyer values the newspaper more than the penny. However for that to be true, both need to know the value of the penny and the value of the newspaper for themselves. So if you know the value of your character and choose to sell it for a given price, your choice. If you are led to think something by someone trying to profit from your ignorance, then it is not YOUR choice per se.
What I am on about here is the cases in which people who do not take things into consideration and let the " buyer lead them into losing" . This is just a reminder for some folks to think about that and give the market some " smarts" .
First, the one selling the character is the one paying the transfer. However you fund the transfer, the base cost is 20 USD or more or less the same in another currency. So the base thing to think about is:
For that same 20 USD you can buy 500 plex and keep your character. So selling a character for little more than the profit of 500 plex is a waste of time, regardless of skill.
Second, if your character has more than the Alpha time constrained skill, or trained in any Omega skill, specially to the fullest, there you invested some 15 US or so in it, plus the 20 from the transfer. So selling it for little more than the add of both is only if the character worth more being taken off of your hands than keeping it and buying those proverbial 500 plex.
Then you make a quick count on the plain skill/month from your character, and find out that in some cases their clean slate and other aspects would infer that to get the same character, someone MUST have laid them back with MCT and Omega to get the same character, so selling it by little more than 1 month omega time is really wasting its potential.
All in all, that is why some people buy any character for 2 or 3 b and you think you making big ISK from it, when they are only getting something YOU yourself could be profiting from much more than that.
Something to think about when you go to the Character Bazaar and listen to “speculator” assessments of your product.