In your statement
In conclusion, you only choose 100% power up when you anticipate the value of USD to be less than STEEM 7 days from the time you post it. Current STEEM price is 6.09 USD.
you say "value of USD to be less than STEEM." Can you please clarify what is the unit of "value"? Do you mean "if the price of STEEM today in USD is less than what you predict it to be in seven days future"?
It has nothing to do with today's STEEM price. It's when you predict USD is going to be more expensive than STEEM in 7 days. i.e. you can buy more than one STEEM with one USD. Thank you for your question!