One more thing to think about i3oilermaker. How can you gamble on how many people will buy? You just say "don't worry, everyone that wants one will get one." So what if you run out and people that originally were going to buy from a real GB doesn't get a chance to get one? Does that mean you'll reorder from SP? There are people like Taeyoung that jumps in last minute and orders a sh1t ton for Korea.
And even at your "group buy price", the time window is only 1 week to get it at lowest possible price. A normal GB has the order thread up for at least a few weeks, even months. Yeah you can argue to subscribe and sign up your email to get a notification and yada yada, but you're forcing spam mail down buyers throat so that we don't miss that 1 week window, when a normal GB has a few months window.
Lastly, I'm not sure if paypal changed their policy, but last time I had to refund someone and also someone refunded me, the full amount was refunded, including paypal fees and shipping. Did their policy change withing the last few weeks?