They need to be made a lot harder if not meant to be soloed. The stone one is a joke. Couple ladders, 4 c4, 4 flame rockets and some bullets. Done. Similar for sheet. I've seen maybe 1-2 people do the hq one because the payout isn't worth the materials.
Yes, I absolutely realize how much work these are to setup. I helped set up many a raid base on previous server. Just saying they may not be meant to be soloed but when they are that easy, very few are going to want to share.
I personally don't mind sharing. I came across a stone one 2 days ago, some new guys woefully unprepared were trying for it. Talked with em for a sec, showed em my method (which Cartmon showed me) and did all the work, let them keep it all. I'm all for more people knowing the content.