Nah, their good skills start at 14, so those only have a 25% chance of success for leveling them. It is a bargain they would take any day. The player probably should have selected some of his bad skills as well, not just the ones with 10, 12 or 14 in them.Maybe let them exchange two rolls for one guaranteed advancement. If they risk it, it's on them.
If the same character gets no advances next game as well, I will let him increase one of his skills that is below 14.
From my point of view, all characters start out pretty competent in Dragonbane. When in D&D do you have a 70% chance of success? Almost never! I really like how clear-cut this is. Especially for things like sneaking.