If Applepay presents a viable alternative that is attractive to me as a seller (and to buyers of course) then I am more than happy to fork out for a new i-phone as a necessary business expense to be ahead of the pack to offer such an alternative to Paypal. 

It was afterall only a couple of years ago that mobile purchases on eBay took off, so much so there is equal to or more mobile purchases than desktops in many markets.  It is only a matter of time before we see a whole range of players launch in this space - thank goodness for that competition when it comes - the market is crying out for it (among other things).