"...when the very largest account only has 3% I don't think it is a major concern."

It is 3% of the SP effected monolithically, whereas the hoi polloi are anything but. This highly empowers the 3% over the total SP pool.

Particularly as pandering affects voting.

As you point out, only more effective disbursement of SP can counter the continuing concentration of SP into fewer accounts, and this should be undertaken with regards to other valuable considerations, as only accounting economic metrics forces reckoning all costs and rewards economically.

Given that the problems seeking resolution are not only financial, such as content discovery, creation encouragement, engagement, and etc., it is necessary to consider other incentive and discouragement mechanisms that may more directly impact them.

Everything doesn't just boil down to money, or we'd all be boiled down already. Effectively resolving extant economic imbalances requires relegating economic factors to nominal import and valuing other metrics substantively.

Thanks!