I don't believe it would cost too much more to do a proper crystal, lume, AR Removal and a bit of refinishing of the case. Those inclusions would at least make the price a bit more reasonable.
Also, you can purchase a Genuine AP movement for ~$750...
I figure $600 for watch, $750 movement, $200 service, $100 lume, $100 Case refinishing, $150 crystal work, and $100 in misc stuff (AR Removal, Pressure Test, etc), Total cost of $2,000
Lets say the plate mod costs a couple hundred to do, you are still coming out with a couple hundred $ in profit.
If you charged $2500 for all of the above then that seems about fair for a fairly 1:1 of a $50,000 watch...