Toastar wrote:
more balanced
Pretty the only explanation. Higher rank = more everything, and in order to keep the gap between new players and old from getting too wide too quickly pitfalls are added.
Also the time between rewards increasing is pretty common in most games, since it causes the person to try to maintain a constant source of pleasure. If they are able to beat the game and the new stuff within a few days/hours or minutes why play any more?