Ok...first, I gotta give Apple a big thumbs up. But also one must look at this simple statistic in a few different ways:
1)Apple, unlike Gap or Staples or Walmart, sells items that BEGIN at the $500 mark and likely average around $1700. Except for the iPod line of course (which nobody buys at Apple anyway) and the low end iPhone.
2)Apple is basically a somewhat new retailer...and only sells its own products. Walmarts and the other giants have been around for much much longer. Thus Apple's "growth" it like any other new kid on the block who sells 5 items year1 and 15 items year2 and 50 items year3, etc....sure the growth is there, but one can always grow quite well in the beginning.
3)While the world shops online (like me with Amazon and BB and other retailers), you kinda need to go to an Apple Store before you plunk down $1700 on a Mac or $500-$800 on an iPad. You want to try it out. This would explain why the brick and mortar Apple Store sells more than online Apple. I would guess there is also a lot of upselling and cross-selling (apps, extra "connectors", and even a more expensive unit) which is not very easy to convince onliners to do (the technology is there to suggest buying something, but many just figure "ahhh, I'll buy it later at the store if I need it" or "nah, it's just the typical marketing garbage trying to get me to buy more"). Humans are much better than machines at persuading you to buy something.
4)We all know (and love or hate) that Apple makes a huge profit on each product while also having 0 sales a year. Good for them. Meanwhile other retailers are pumping out flyers and promos and specials and coupons every week...that's the traditional retailer way for like 50 years. The exceptions to this would be the very very small niche of retailers that only sell their own products (Apple, Bose, Sony Store) who may choose never to have a sale. BB makes very little on the computers, tvs, refrigerators, etc. it sells. It makes its real money on accessories, service, and support. Sure, there's always the fool that walks into BB or Sears and pays full sticker price for an overpriced brand-name tv.
Again, nice to hear regarding Apple. But a few things to ponder the "statistics" that folks love to publish.