I don't think I have ever gained so much salvage that I needed to delete the common stuff without taking a break and thus dumping stuff in my base. Granted, I might do all of 2-3 runs. I might have done 4 or so a couple of times. Even before recent changes, I think 5 tunnel runs in an hour would be my max, and I simply don't have the tolerance for doing that stuff for over an hour. Not when I can plow through (farmable) regular missions. While yes, AFK farming is a thing, and I work from home, I prefer dual boxing and that tends to go against AFK farming.
FYI, based on current yellow salvage pricing, it simply has spiked far too much to say the market inefficiency is causing the issue.