I think you are overestimating the appeal of a large win with a near zero chance of success. With the current price of Bitcoin, finding a block solo is worth about $20k but is extremely difficult. Miners aren't leaving pools to solo mine even though solo mining is very much a lottery at this point. Gamblers are willing to sacrifice some EV in order to achieve a sure return.

Now if solo mining offered a higher EV than pooled mining more people would take the chance, even if in practice it was very boom or bust. Offering 900x rewards at 1000x difficulty creates a situation where the EV is lower than in a mining pool, as well as creating a situation where most of the time the miner will see 0 return for their investment.