At some point, people will get tired if they cannot turn what they earn into money. The reason why I don't play game of points is because every amount acquired is just dummy and worthless afterall just some imaginary riches. Imagine what would happen to your platform if it can afford people the opportunity to change into something worthwhile.
My advise, I think its time to start opening up to other things that are about moving to the next level. When it get to certain point even your dream can be too big for you alone to carry that you have to bring in new people and that is the stage you are now for you to have garner such amount of bloggers on your platform.
One you need to start accepting those corporate organisations ready to advertise but rather than collecting money for the space, try something like partnership in that instead of them paying you, let them have a market place where those token holders can use their tokens in addition to some amount of dollars to buy on your advertisers site. Doing this will save you a lot of trouble of managing financial laws of having to convert tokens to money, and again the companies approaching you gets what they want which is publicity everybody wins.
Maybe you're underestimating the willingness of people to simply earn tokens and numbers in the hope that one day they strike it big. It doesn't help when we've had tokens like Nano (mrai/xrai or whatever it was called) easily "earned" at one time and then just spike in value making instant millionaires for a few. I was guilty of it myself in the very early days, faucet hunting when I was learning my way around, those numbers had a way of making me feel rich. All imaginary, as you said. But then we have had examples like the one I mentioned.
But yeah. People need to create value, and useful value at that... they don't realise it yet, or maybe never will. But as long as there will always be examples of the points game making it big, people will refuse to change their dreams.