There isn't really a problem with large bonuses for the reason you mentioned, locked up Ether for a long period.
But there's a problem when only big investors can claim a bonus. That just means the rich will always have the upper hand and small investors have to pay a penalty for not being rich.
the big holders, rich, as you mentioned, are rich for a reason, are patient, hold their coins and face the difficult times with them, many small investors want to grow, but do not hold in moments that should support the currency out of fear, or for wanting quick wins
Then rich investors always have an it easier and continue to get benefits while for smaller investors it'll be harder to make a profit. But that's just the way cookie crumbles. You need money to make money.
I've been for a while in the crypto for quick gains, and this led me to believe how impatient we are in some cases, I've seen promising projects like Ehealth becoming a success in the future after my total sale of tokens, and seeing the opportunity pass by a few times
That's a human factor, the whole market is based on it. If everybody would only sell the lowest and buy the highest, there would be no market.
As for the returns, it depends what's a big profit for you. I think all crypto holders are a bit spoilt what comes to returns. They want hundreds of percent, forgetting that if you for example put your money in a bank, you can get just couple of percent interest rate.
