Obviously you'd know better then me on this but I'm just mentioning how its not completely bound to revolve around just the largest wallets. I believe it gives some priority to those who've not staked before over somebody who staked 5 times already today. Thats how someone who is a much smaller holder would still be involved despite not being in the top 100 list. The coins on Bittrex arent involved in staking either afaik, so theres that positive also as some incentive to setup a wallet even the smaller or newer participants.
Actually the reason it doesn't give that incentive is a good thing. For example, I can split an input into 1000s of outputs. If Coinage was allowed those tiny outputs could sit for a while and generate higher stakes. It also lets a user gain more network weight by not being connected which is clearly a security hole. Rat4 removed this for those reasons.
Lets say a guy with 100 coins has a 10x lower chance of getting a stake than a guy with 1000 coins. That is totally fair because they BOTH average about 1% a year considering a reward of 1.5 coins. So if a guy with 100 coins is connected for a year he will see a block more or less. The guy with 1000 coins might get a stake per month. It doesn't favor the rich.
Consider DPOS which does favor the rich. Once you get into the 100 delegates or 20 delegates or whatever, you can pay people to vote for you and stay in the top. Also, it's less people validating the chain. For pure POS 3.0 there could be as many people staking as there are people connected. As incentive rises to stake, people upgrade hardware to run the full nodes. DPOS was never necessary and was a centralized workaround to make a glorified database. It paid off well because the devs could roll out a product but it wasn't actually secure and neither was the trivial data (like Steemit which stores it's data elsewhere).
POW also favors the rich because wealthy people can build better hardware to dominate the network. Also POW is notoriously prone to being forked for smaller chains. This is because the "small chain" is only as secure as the "big chain". Basically BTC miners can at any time point their pools at weak coins, perform double spend attacks and destroy those chains. POS doesn't suffer from this at all because the network difficulty is contained within it's own network. Only people genuinely invested in Blackcoin can attempt to fork it.
The reason to get involved with Blackcoin is that this network has been running securely for 6 years and it has never been forked! Furthermore there is software like BitHalo/BlackHalo and the new developments with More and such.
With less people staking, it does give an incentive to connect and stake because the higher reward. It's good to look at network weight. Still the volume needs to be there. Blackcoin needs to keep developing to stay competitive.