But see, that just takes things into ridiculousness - because the player's HP level will not go up completely in relation to the strength of enemies, there will just be enemies added later with attacks that will virtually invalidate any HP gains given. 10000HP? Hah! Here's an attack that does 1 million HP! (Okay maybe that's an extreme exaggeration, but you get the idea). Simply adding bigger and bigger numbers isn't really good game design. Making players use what they already have effectively is.