I was thinking about multipools today... they are motivated by a few things: Profit and Speed. Low diff + lots of hashrate provide both of these things when a coin is getting some traction. I would argue that the SPEED factor plays in quite heavily - they want to get in and get out, dump and roll on (once the diff is increased due to their hashrate blowing up the algo).

The KGW adjusts the diff to make it harder to speed mine and leave a coin hanging on the re-diff. But what about one other aspect - what if a mined coin needed a "cooling off period" or some such other thing that made them unable to use for X blocks that would translate to hours (or even days) when first mined? Once they "matured" they could be spent as usual, but at first they are unobtainable or unredeemable. I'm guessing even a small delay in "usability" would make the multipools run for the hills. Example: Once you mine a coin, those coins are unusable for 120 blocks. If a multipool did a hit and run (without the KGW to fix) the coin left high and dry would also screw the mined coins because they would be in limbo for 120 blocks (and since the multipool had rolled off, the confirm time would be really long... further screwing their hit and run profits). Patient, devoted miners wouldn't care much, just mine and spend as normal, but the hit and run folks wouldn't touch the coin due to its tardy method of payout.

Does this exist? Is it possible with the current infrastructure (just curious). Even a "cool off" of 30 blocks could mean the multipools ignore the coin as "unminable" within their motives.