1. I don't think that the load on the servers is less if you trash a thread.
It still exists; you just can't see it.
I think the admins intended that feature help you, not the servers.
I expect to pass through this world but once; any good thing therefore that I can do, or any kindness that I can show to any fellow creatures, let me do it now; let me not defer or neglect it, for I shall not pass this way again. Stephan Grellet