You miss the big picture. Whales could care less about getting $100 on a blog. That is like you going to bank to deposit a nickel. I think they post to form a central consensus for Steem.
See more at:
top-5-reasons-why-whales-posting-content-is-good-for-steem
But what if 1,000,000 people deposit 1,000,000 nickels. I see what you're saying though.