it is nothing but a waste of time

True, but only if you think about Steem as a way of milking rewards for quick profit.
Rewards.
For value added.
What kind of value those posts add to the platform?
From what you stated above - content is irrelevant, so in the end there's only bidding in the equation and that makes your activity a pure gambling, and when it comes to gambling, there's always only one winner - the house - bid bots in this case.