When Rarity walks into your office asking for a favor, you see an opportunity. You decide to tame her, turn her from a proud business mare into your toy.
“Behind every bit of luxury, there’s a bit of practicality. Behind your fancy clothes there’s me making sure the textiles have the right colors and the ponies don’t get poisoned from wearing them. Behind this wine there’s another chemist making sure that Prench grapes don’t get eaten by insects before they get a chance to be turned into whine.”
Was that on purpose?