Now you give your proofs that you used paid acceleration services, then how could you cover up those fees if using paid accelerators when in the first place they charge high fees and now that you are giving discounts.
Or this is still case to case basis, depends on the transactions. Or just fixed fee from your end.
It's quite simple, I'm not in this for profit, I am just a nerd that wants to help people. I've even fronted the acceleration costs for some users who promised to repay after confirmation. (Yes I have and do get burnt doing this sometimes, but I still want to help out)
My time and know-how are free.