Different Tiers of Masternodes (like CROWN or ZEN offer) are def a valid option imo.
Would be totally fine with including 10k & 30k Masternode Tiers.

but dont leave guys out with simply raising the collateral +1
Such diversifying Tiers on collateral of masternodes have potential to increase total difficulty on the network of Diamond coin.
Do I understand it right, Rumhurius?
If more masternodes on higher Tiers (higher collateral, consequently) will create more competitive run to find blocks, then difficutly will be forced to raise later.