I think it's tasteless (and the other ones you mentioned too), you can sell things without steam and it wouldn't be a problem if they had to sell it on their own site. Steam however don't see themselves as an authority on taste so it doesn't matter anyway.
Pffft. Not pompous enough.
His majesty Azmodeus Tarquin Montgomery of the House von Riva, first of his name, by the grace of Kira of the Kingdom of ___ and of her other realms and territories, Fidei Defensor, Mother of Dragons Father of Chunders.
Some kind of whip/chain/rope. I think in an anime it would lead to impossible stuff like this scene from house of flying daggers. I haven't heard of or watched the animé though so I don't really have any clue how they work :P