Originally Posted by TheOOB
Think of it like this, if a fighter wants a flaming longsword, do you roll to see if they can wield it after they spend money on it. No young don't. You let them buy it and use it, or if you don't want them to have it, you don't make it available for purchase.
The difference is though, you can take the sword away if it's causing trouble without inconveniencing the character for too terribly long. The spell by contrast cannot be so easily removed.