Thinking about Speed Creep

http://s32.postimg.org/9rdw0zgpx/Untitled.png

There's a maximum purchasable amount of speed at any given point in the game due to the amount of gold the player has available to spend on things.

In my opinion the value of gold as an agent of purchase and a game-decision for players is enhanced when the player must choose between purchasing speed or some other possible benefit, such as damage output, vision and so on.