Ah.. That makes sense.
That said - ima a bit sad:S I believe when I first started to read into crafting mechanics, someone told me that if you allready had an affix - legend or epic - on an item, then that would eliminate the chance/risk of rolling that crystal affix on the item.
So ever since I've tried to apply whatever affixes I didn't want on my items before adding obsidian.
Pointless effort it seems now:P
Thnx for enlightening me though!