If it were a Nintendo DS, which you could buy used for 50 euros or something and which is the platform for boatloads of games now and in the future, maybe I would indeed specifically buy one just to play ADOM (I more or less bought one specifically to play Pokémon, back in the day, though I also took into consideration that I would be playing more, other DS games).
The problem with the iPad is that, right now, it's just too hilariously expensive to get for a game that you can essentially play on just about any stationary platform (thanks in part to your own work ), if you aren't otherwise attracted to it. Just by the monetary decisions involved, it's much, much easier to convince an iPad owner to try out iADOM than to convince an ADOM player to buy an iPad. It takes a very special (namely, rich) kind of crazy to make such a purchase solely to be able to play ADOM on a couch or on the bus. We didn't all take Wealthy - Very Wealthy - Filthy Rich - Boon to the Family when we entered the Drakalor Chain (though quite a bunch of us did take Miser).