It seems like they are attempting to use a greedy algorithm on a problem which very obviously has local extrema. Yep. You'll end up with a lopsided allocation,

It seems like they are attempting to use a greedy algorithm on a problem which very obviously has local extrema. Yep. You'll end up with a lopsided allocation, with one or two allocations holding a very large percentage of the total allocation. Distributing the allocation weights could help, e.g. with ensembling, regularization or some other kind of penalty.