I don't see what people gaining good reward with low investment would be an issue.
If they get good reward with low level cards it means they have skills to play, so they deserve the rewards.

Also if you want to get high return for low investment it is better to buy one starter pack with some untamed packs, rather than 2 starter pack. The daily reward is exponential as you move up leagues. Therefore it is better to have 1 high ranking account than 2 average accounts.