As many have commented, the AeroPress uses more coffee per serving than other methods (e.g., French Press). I earlier posted my coffee-stretching/saving solution.
Alan Adler, the inventor of the AeroPress (and the Aerobie Flying Ring - pictured behind him), has this to say about getting more from the AeroPress:
For those who want more extraction from the AeroPress, here are some ways to accomplish that:I thus may tinker further with my procedure. Since I already use my grinder's finest setting, I'll try a combination of longer extraction times and less water (I currently press all 10 oz or so through a 1-scoop serving; maybe I'll cut that in half to about 5 oz. of hot water).
Use finer grind, that requires a VERY GENTLE pressing. That in turn takes longer and you get more extraction from the fine grind AND from the longer wet time. My experience is that you can push extraction up to 25% this way with no increase in acidity or bitterness.
Press more water through the bed of coffee. That both extracts more and reduces the strength of brew trapped in the puck. My experience is that this noticeably increases bitterness. But rasqual [a CoffeeGeek Forum poster] likes this approach.
Use hotter water. This may be better anyway for light roasts -- even if you're not seeking to reduce coffee expense.
Have fun, do a lot of tasting comparisons. They needn't be blind, but side-by-side comparisons are recommended.