I've done some art handling (transporting from collectors to galleries). One collector asked me if her painting could be touched up a bit. We didn't provide that kind of service (^_^')
They end up on my wall. I figured that I would rather have originals that were not quite to my taste than prints of Pre-Raphaelite masters that are a shadow of the real thing. I still have plenty of wall space. When I run out of room I'll move some on. I can scarcely lose out financially! I plan to get in with some dealers for their junk later on.
Learning to remove varnish is a fun thing. It would be very easy to ruin the painting, but fingers crossed it has not happened yet! Each painting is a whole new challenge, with different varnishes and paints.
My next victim has some tiny holes that need patching, which will be a whole new avenue! A never ending hobby