I take on board your points, but they don't stack up, you obviously have a bee in your bonnet about having a debate about a subject you profess to know inside out. If it is a crap job then how will you better it?
I would suggest having refurbished many many bats myself that the hardest job is the removal of the stickers, they are not designed to come off with ease, then the glue will clog up the sand paper if you are lucky enough to have a drum sander.
Then how much willow do you sand off in order for the bat to go back to the owner at the same weight and balance?
GN are not here to work for free or cost, they wish to make a profit, they have to pay their batmakers for the work they carry out, they have to cover their overheads, they have to pay for the consumables, they have to pay someone in the office to take the enquiry, order, assignment of work and packaging.
Your argument centres on being able to do a better job, yet then you claim not to be able to do it as you don't have the tools, however you have listed them as sand paper and a craft knife. I wonder if you have actually done this before in which case surely you have the tools and time to perform this task.
This is not a win win situation for me, I merely want to point out to you that the job done may not be to your liking but you cannot offer any alternative so why moan?