Personally, I think that the WS winner should get at least enough reward points to purchase two more seasons. From there I'd say the WS runner up gets the same $25 credit, the LCS runners up should get a $10 credit, the DCS should get a $7 credit, and the division champ should get $5 credit. Then, anyone who misses the playoffs, but is over .500 should get a $3 credit (that Idea I read somewhere else and don't feel like looking it up now, but I want to admit that the last part isn't my idea).
Probably not the greatest idea, but it seems pretty fair to me.