The point is, it's more like a package deal that you may not necessarily want (especially for people who already bought Cactus in the first rainbow ticket gacha), so it's factually incorrect to say that the bride is only $50.
Businesses do this all the time, though they'll try to mislead you otherwise. It's not "$39.99/month for internet", it's "$39.99/month for internet, cable, and phone lines you may not use but tough shit, you're getting it even if you just want the internet."