I disagree that collecting machines is worse than dumping them; assuming the collector takes reasonably good care of them they are at least being preserved.
Now if it's a situation where someone is buying perfectly good machines and putting them in a pile outside to rust and weather, then I agree that's a problem.
There isn't really a shortage of functional machines - I don't feel bad about buying something just because someone else might also want it or use it. Especially since I often deliberately pick machines with problems - they're the best deal AND they teach me the most.