Maybe I am misinformed on that one, but I thought the plan is to have only a very limited amount of block producers at any time who are being "delegated" (is that what the 'D' is about, or am I wrong here?) by the network users, so I would make sense to delegate someone (or a group) who is capable of providing a lot of processing power compared to the rest. And processing power is somewhat expensive so that is what I meant with "wealthy".