What's lazier? Getting six months of syrups and cartridges at once, which weigh about the same a a few liter bottles of soda, or humping multiple bottles of soda every week over and over and over again? The big issue is whether Americans can change their routine from carting bottles from the store every week to making the soda at home from a small, stylish appliance that doesn't use any electricity. It's easier and smarter. The switch won't be overnight but it'll get there.
Many have claimed "Americans are too lazy, they will never buy this product". But in 1Q2011, Americas revenues increased 153%. The lazy one is the guy that makes the claim without bothering to check actual sales data to see how popular the product is.