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Seriously, it's just a reasonable suggestion to allow witches and wizards to decline a skill. But the response is, "No, it's not classic, it doesn't fit the atmosphere..."
And what about when you level up and are offered two new skills – would it be atmospheric to allow the option to decline both?
P.S. Lol, a guy in the neighboring thread also wrote about this object; it turns out it's called the "market of time" :)