How about giving a little "bounty money" for the staker of the millionth block? Not a big lump sum but like 1k or 500grc? Also some kind of small bounties could be made for example "find a mega prime that ranks in top 200 of The Largest Known Primes Database (PrimeGrid's PPS Mega Prime Search)" This is just an example but something like that? I listened the BeyondBitcoin Gridcoin special and they were talking about these kinds of bounties and I thought this could be a good thing when done right.