Yes, typically Apple wanting a large slice of whatever they touch, like the app market.
Let a gorilla like Apple into your market and soon your slice will get smaller and smaller, slice by slice.
They call the the salami game, one slice is not worth much, so you let it go, then another - soon all that is left for you is the string, and that is not worth fighting about either.
That said, the greed of the banks/cards with their 3-5% (?? or so) fee on products that might well have less than a 10% margin has invited competition, as all vendors hate these high fees, and if Apple charges a lot smaller fee, they may well shoulder their way in. After all, the merchants now finance all these points, and miles etc, so some good may come of it.<p>So I say let Apple in, but also let in google and facebook and other payment methods and cards, lets get a broadly based competitive milieu going.