Hi Trevor,
Cost likely depends greatly on prices from local sources (i.e., in your area) for the materials. I didn't total things up for these, as it was a company expense, and a one time 'sunk cost' purchase.
In our case, we have staff using them to hold up desks, and the traditional sort of legs were 4" x 4" timbers. Because we must follow ergonomic rules for proper working height, each desk potentially ends up a different height.
Some staff also want/need to work from a standing position, others sitting down. Since we have limited storage space, we can't stack up numerous wooden legs for each height table. That means we're looking at purchasing new timbers (at approx $30 per table), then cutting to size, etc... Any waste or excess wood had to be tossed (no storage, remember?) which is very wasteful. Changing to different length legs, is also an issue as well; as it means removing a bunch of screws, sheet metal brackets, etc...(very time consuming!).
So while the bolts and nuts, washers, aren't the most convenient; given our old way of doing things, they aren't the least either.
I also think they help make the legs more rigid, which helps with stability.
-EN
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