There is, officially, no such thing as a "self-service" Treasure Yard around here. The big yards have actual staff that are supposed to retrieve the parts you ask for, and then the customer pays for the part...and the labor to remove it. I have watched his employees carve-up three parts in order to sell one. You want a rear axle, for example--they'll Oxy-Acetylene the shocks, brake hose, park brake cables, and control arms or leaf springs to get it away from the body.
IF the owner decides to take a shine to a potential customer, he'll let the favored customers "free range" with tool boxes and such for self-service. Bring the stuff back to the office for "checkout" and pricing. I love walking the yard, discovering good/rare parts. Still expensive, though.
So now I mostly deal with a one-man operation. The selection is limited; but the prices are dirt-cheap if he does have something I want; and he lets me remove the parts myself. One downside is having to check myself for ticks when I get home.