1st of all, you bought it doesn't really means you own it; you can solve most of your questions by reading those small mumble jumble of tl;dr text call 'End Users' License Agreement' aka EULA that mostly goes something like 'all yer base are belong to us... it's our choice to decide whether you live or die...' kinda stuff.

you as a wow player should had gotten the basic idea that you don't really 'own' your toon but just paying them for the entertainment they provided and space they used to store your toons.

although sharing is caring, but peeps with bad intentions would always see it as an exploit and creep his way into you bnet account... and you never know when it hits ye...