Good point. Just as bad, is that someone pays for a plan that they shouldn't have paid for, given that situation. There are numerous people still trying to peddle old plans on the web, that can actually be found for free. These are plans where nobody is pursuing the copyrights, but the seller does not have specific rights to. In that case the plans should be free, and fortunately a few places have popped up, now allowing downloads of these plans for free.

As for free plans listings, unless someone wants to maintain the listing, they generally become a compilation of dead links within a short time.