Okay, as an actual Wiccan (Or Witch, I take either one) who ACTUALLY knows a few things on the topic, let me make a potentially pointless attempt to clear things up; I'm not the most knowledgeable on the topic, but I feel it my duty to clear some things up.
First of all, Mythrandia is being hilarious.
Being a Witch/Wizard/Druid etc. Is actually a legitimate, fairly old religion, you probably know it as paganism, and was actually one of the more predominate western European religions; We're pretty sure, it's a little hard to tell considering that the Catholic church kinda rolled in and destroyed every trace of it. What bits did survive eventually came into the US in the mid-50s as Wiccanism or Paganism and has been a growing religion ever since. There's probably a few covens around where you live, you can usually google it. Like all faiths, please try to treat it with a baseline of respect.
At the onslaught of the Harry Potter craze, it saw a HUGE boost in membership. Unfortunately, most of the people joining were silly teenage girls, who misunderstood the faith as being less about spirituality, ethics, internal focus and peace, and more about OMG I CAN BE REAL WITCH AND MAKE SPELLS AND TINGS. Spells, potions are a factor of some Pagan's lives, but more than anything are a method of personal focus, meditation and spiritual reaffirmation- I'd equate them more with Christian mass than Wingardium Leviosa. Selling spells and potions is almost NEVER a thing you'd do, and is born out of a gross misunderstanding of the faith, or an attempt to prey on those who misunderstand. The most you'll see actual Pagans selling is candles, ceremonial knives, stuff to DO magic, but selling magic itself is really not a thing you do.
Anyways, just figured I'd put that into context for you. It's important to have at least a SLIGHT grasp of the topic you're speaking about. FYI, I've been off-practicing for a while and probably forgot a bit of my history on the topic, (It's also really early, and I'm tired) so you can find out more at http://www.religioustolerance.org/neo_paga.htm
As for the issue itself, I understand that they're banning this out of a desire to protect their customers from scams and injuring products, but I can't help but feel it's born out of a little bit of conservative political meddling. Still, it's not enough to really bother me.