I can only imagine how absolutely shit your whitepaper will be if you only charge $80 to write it.
Likewise, I can only imagine how trash a project must be in order to think $80 is a reasonable price to pay for a critical document.
There is a reason writing agencies charge several thousand dollars for these documents.
The reason i charge this depends on customer to customer. i can also charge $1000 plus but everyone has a budget, for instance a one pager document why shouldnt i charge $80 for such a simple project?