Buying Mac on Sweetwater

I just called Sweetwater to negotiate a deal on an entire DAW package: Computer, Interface and PT 11. The offered $300 off the entire purchase; I was obviously hoping for more! Anyways, has anyone bought a Mac thru these guys? I wanted to buy direct from Apple, but figured that I'd get a better package deal if I bought everything with them. However when I was looking at the specs on their Macs, I noticed the same MacBook Pro that's loaded w/ the Yosemite OSX in the Apple Store comes with the Maverick OS X from Sweetwater. I didn't notice this until after I hung up with the Sweetwater rep. Any clue why they do this? I'm not sure why I'm hesitant buying the Mac via Sweetwater, but this doesn't help.



Thanks,

Adam