Threads like this tend to show a lack of understanding regarding fructose. Agave and sugar have excessive fructose. Your body cannot process fructose as fast as glucose. These use two independent paths, which can are independently maximized. Additionally, they are too sweet, causing you to water it down or crave plain water deep into your ride. Fructose build in your gut may also give you this water craving.
These sweeteners work good paired about 1:1 with dextrose, which can often be found at a brewer supply. A half dextrose/half sugar combo will give you a glucose to fructose ratio of about 3:1. Dextrose is sweet in itself, so you may want to consider substituting some dextrose with low-sweetness maltodextrin. (hint: md and dext are both pure glucose, just with different particle sizes. Maltodextrin is a larger particle size/chain, which reduces sweetness. Different grades of particle sizes exist for maltodextrin, creating grades of sweetness and osmolality, which affects absorb rate--- this chain size/osmolality issue is debatable due to lack of certainty about how long it survives in the gut.)
The drink manufacturers really have us. Most of the material cost is in maltodextrin and standard sugar, which is less than $1 per pound. I suspect that marketing cost far exceeds that. Lim chose good packaging, stand-up pouches are dirt cheap.
I get a 75lb bag of (flavorless) Maltodextrin from a local brewery. I mix it in my bottle with water (flavored with decaffeinated green tea), then add some fruit juice for a little flavor. Works really well on rides over 60 miles, no cramping and no hunger pangs. The bag last over a year, I think it is a cheaper alternative (and as effective) as any sports drink I've tried (Cytomax, Ultra Fuel, etc.).