I don't know the numbers for EU region, but chances are good the math says that the profit:loss ratio of making XBox disc for EU region wasn't good enough for it to go into production, same as with NA PS2.
I'm not privy to the numbers myself, but that's what makes sense. I'm pretty sure that if the numbers were there to back up the case that making XBox EU and PS2 NA discs would lead to meaningful profits, SE would leap at the chance.
To be clear, I'm not telling anyone to be happy about this or that it doesn't suck. But have some understanding about why things are the way things are and you can see that this isn't SE trying to anger you... it's just a crappy situation.