What if (about every 10, 15, or 20 levels) we could get offers for diamonds similar to the first purchase offer at the beginning of the game. But instead of 1000 diamonds, it could be on a smaller scale, like 250 diamonds with any purchase made. We all know as we level up, earning diamonds isn't as easy as it was when we were far lower in level. So I'm suggesting a diamond bonus with any purchase after a certain number of level ups. But I feel as if this would work best for players who have passed the 100 level mark, that way players would stay into the game longer, and most likely invest money more constantly. Thank you for your time.
Don Flaco