Eccentric people do weird things. That said, he owns them - collected them and are his to do whatever he wants with them.
At the time of collection they probably didn't interest many and the fact someone now finds them interesting today doesn't mean he's not entitled to let them sit and be garden ornaments. He probably gets off on the fact people want them and are always pestering him for a sale etc. In the end he'll die and some will be saved. Others will be scrap and then this mass (picture) will be lost to Peak Hill forever. That will be a sad day!