Once the friend going to the USA pays import duty and all the taxes, how much do you think does it cost? And I don't know Apple's rules, but in many places you can and will be fired if you use your employee discount to buy for someone else.
If you're taking a laptop, they won't even blink.
As for firing employees for giving friends discounts, while I worked at Apple, before 2006/7, it wasn't an issue. We had 10% off everything, 15% off 3 items and 25% off one item per calendar year. Of course those discounts were meant for friends and family as well. My manager even helped me with getting a friend 15% off his iMac.
Employees have always been required to prove that they still own the product up to a year after purchase, if requested by management. They can be fired if they can't produce the device.
When I worked for Apple retail, there as a huge yearly program Apple corporate did to pull interns in from Apple retail (for corp positions), many leading to corp hires.
Um, no. Never ever have I or anyone I used to work for been asked to prove I own a device. As most had iPhones when I left as it was just released, management got the first model free, the rest of us got a small discount. Never, in two stores in NYC, were we asked to prove we owned an item. Aside from devices you can carry with you, iMac's, Mac Pro's or even MacBook Pro's, you are never asked to prove you own it at any time after your purchase. I'm sorry, it's rare that I am this emphatic, but this is absolutely untrue and I know it still is through my friends still with the company.
As for bringing in retail interns for corporate work, I have never seen such. Apple retail and Apple corp. are too entirely different segments and rarely, if ever, do they bring retail management, etc into their Cupertino/corp. base. Apple was/is notorious for their "glass ceiling", and was well known for keeping that divide.
My good friend worked with Apple corp. years ago, moved to LA then reapplied. She spent a year interviewing with them in a corporate position. After numerous flights up to the Bay Area, phone interviews, etc she was finally re-hired and moved back to the bay area. Many qualified candidates are rejected by Apple, Inc.; they keep a tight ship of multi-talented experts they can move around between departments and unless you have at least a stellar college degree (in which case you're entry level and working your arse off) or a Masters (in which case you're middle tier and, yes, working your arse off), Apple corp/Bay Area is extremely competitive. Google is notorious for their Ivy League loving headhunters/HR, and Apple is extremely difficult to obtain a corporate position, even at the lowest level(s). So no, there is most certainly a glass ceiling with retail vs corporate in Apple, and I can assure you if someone interned at Apple (for pennies if that), they must have been a diamond in the rough.