because you don't have to pay for the cheats version at all. in fact, we would wish for people to ONLY play the default verision, because it would give us better feedback and a clearer picture of the game balance and what needs to be tinkered.
the cheats version is just a small bonus for those who want to give us the extra support, for which we're eternally grateful for, but there's absolutely no need to play the cheats verision, it only riuns the real game experience.