Buying on impulse is part and parcel of going to an EXPO!!
Same as walking into a pet shop, it happens every day.
It is up to the shop to inform the person what is the right way to look after them, give them a care sheets and make sure the person has all the right equipment for the care of the "pet" and the new owner knows what to do. And advise the person to join a forum where he can get the correct information.
Sounds like Tachja knows what he is doing, just wanted advise regarding the tail.
Instead people get hooked on the research and the fact that the thing might become agro rather try and help the guy, instead of telling him to stick to other things.
This forum is to help and not enforce, that would be down to BV and the moderators on the forum.
Tachja read through this link, talks about the tale.
http://www.greenigsociety.org/tailloss.htm