It seems to me that a better way of doing it would be to say "do you want this medium priority or high priority" and showing the average fees each option takes, and then deducting the exact amount of the fees you pay (as directed by the customer) from the withdraw.
Yeah, I see. It's the wording you're objecting to.
JD says "0.001 CLAM will be deducted from the amount you type for use as a transaction fee" which also isn't strictly true. It will be used as a transaction fee, but not necessarily for *your* transaction.