The chances always sound much worse when you say it the other way
For instance, while trying to get Dorca I have a 10% chance to get her and you always tell yourself that the 10% chance will eventually come around but truth be told that the odds are 90% chance you wont get her. The odds are the same whether it be 10% I will get her or 90% I won't, just the much higher number makes it seem a much more difficult task in my opinion.
The joys of farming I guess. I could have chosen a mission with better odds, I just wanted more healers as I have a lot of Khuri's at the moment so really didn't need to farm her mission.