It was pretty easy to stack your team in past DD's without spending a cent. The whales who spend a thousand dollars are rare and you rarely encounter them. They throw the balance of the game off, but they provide enough revenue to the game makers to where they can be ignored by most, unless you are unlucky and run into them.
I want the game to be balance for those who spend no money, only have preorder/special edition bonuses or send a little money. These make up most of the online population. I want to be able to go into games with teams that only have a few stars and a balanced rotation and actually need to use bullpen arms strategically to win. Not brute force a lineup of all 99s and just out homer my opponent and throw high 101mph fastballs.
The real issue is people getting their accounts hacked which was a huge problem with Fifa and other EA sports games. I don't think DD is that popular (yet) so it may not be a real issue to worry about yet.