I have not kept bees with topbar hives... but I plan to start moving that direction.
From my understanding, it's common practice to leave the crushed comb near the hives for some period of time:
- to allow the bees to clean out the residual honey
- for the bees to take some of the wax for rebuilding the hive
As for the remaining wax that you take as your share, certainly it has better uses than burying or composting.
By melting it down and straining it, you have a reasonably valuable product for MANY uses.
Here's a link I found for a
solar wax melter... pretty simple, but something I hadn't thought of before.
solar-wax-melter