I apologize if I gave the impression that an MMORPG-style or reward was what I was looking for. That's not it at all. I was just using that style as an example of playing to human nature by offering multiple incremental rewards. No, my concern was that the level of rewards might be so sparse as to discourage repeat play. (I've only played two of the adventures that are out so far, and I believe that they both max out at 5 SP. But then again, I also think that those were introductory adventures.) So, when comparing the rewards that I've seen so far to the changes in advancement costs, I was concerned that the pace might be too slow. Seeing that Clint plans to set 10 SP as an approximate target for an adventure eases that concern.
Thanks to both of you for the replies.
Scott