True from that perspective, but I guess that when you sell it, people would'prefer' to see Lion on the box rather and SL. Plus it's less hassle for the buyer really, if they ever need to do a clean install..
I just chatted with an AppleStore agent, and she says Macbook Pros won't necessarily ship with Lion if you buy them today:
Hi, my name is Holly. Welcome to Apple!
Holly: Good afternoon!
You: Hi, if I buy a macbook pro 15" today, will it ship with OSX lion?
Holly: With it just being released today, I cannot make any guarantees that it will. But if not, you will be able to download it for free from the Mac App Store.