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If they have 80% efficiency, a 1000 pound load on one side would require a 800 holding force = 1800 # on the anchor in a static situation. I think that David's diagram suggested that number. 200 pounds of holding force is supplied by the friction of rope on rings.

Don't worry about wearing things out, consider if they make you more money because you can set from the ground, etc. I think that there are two aspects here in the forces. Blocks will double the force (almost) only when both legs run 180*. You have rope stretch in the system. You have less...

Rings seem to be more for lowering. Blocks can be used for lifting with greater efficiency. You can hang a ring and ring rigging point with a throwline, as you would a climbing line. You can use a Static, Remotely Removeable, False Crotch (Block) so that you don't magnify your forces again by...

Me, too.