You have actually brought up quite an interesting question and something we have discussed a lot.
If you think back to the huge selling pre workout products over the last few years, the legends have usually been something that has a huge stimulant component however, regulation of these has obviously tightened hence people moving away from DMAA, AMP etc.
It is very difficult to strike a balance between stimulant strength and the other ergogenic ingredients.
For example, if we added caffeine to High Volume, how much would you add? If we did 400mg per two scoops a lot of people would think this is far too strong but if people wanted the high doses of citrulline and arginine nitrate, they would need the top end dose.
So, if we brought it down and had 300mg per two scoops we would be left with 150mg per scoop. There is a large chunk of the market who would say this simply isn't strong enough for them.
Either way, it is a very, very fine balance and it is impossible to please everyone. In a way I wish we could follow suit of just throwing stimulants in a jar and leaving out other expensive ingredients but this just isn't the way we want to formulate a product.