While I agree that we should focus on improving rewards for owners of larger collections, I think that it should all come down to rating, which is a simple and intuitive system. Larger collections and higher-level cards should convert to a higher win rate, which should convert to a higher rating, which should convert to more rewards.
I think that it would be beneficial for everyone if the reward system was set up so that it wouldn't make sense economically for botters to run thousands of accounts, but rather to collect assets in one account and bot on that one, in an attempt to get as high rating and as many rewards as possible.
This would motivate everyone, including large botters, to buy many cards and combine them to higher levels. For this to happen, we would need to shift the distribution reward to the tail of people with the highest rating, which is fair in my opinion, as these people have made significant investments into owning the game assets, including SPS.
I would love to get more opinions on this.