Is there a written rule somewhere that people cannot sell the same item via multiple accounts? Or is this something that is more along the lines of a mod's interpretation of the rules?
I don't think there is one that explicitly says
You cannot use alts to sell the same thing so you can take it as my interpretation if you wish, but it directly contravenes the
one thread per person and
one bump every 24 hours rules. It can certainly be added to the rules, but this is exactly why BadBear was against posting them in the first place because people then just try to evade them on technicalities. OP knows you can only have one thread per person per same item/service. He knows you can only bump once per 24 hours, hence why he uses multiple accounts and dozens of others to bump them. It's a direct attempt to evade rules and spam the forum. He was told about this numerous times, on numerous accounts and had numerous bans yet he ignored them every single time and continues to do so.