Selling a collection of disparate bikes, as a complete collection, usually guarantees a low price. Having a tonnage merchant, who relies on fast flips, as your buyer cuts your values down to low wholesale. Convenience has its price.
To realize full market (a.k.a. retail) value, each bike would have to be individually inspected by someone with model-specific expertise. Anyone notice that the `77 had a K0 tail light? I still wonder if the K3's CRB paint job appears a bit lifeless in real life, or just on TV...that's just the tip of the proverbial iceberg.
That level of scrutiny is completely outside the reality of the necessarily ham-fisted approach of a pawn broker & restoration/customizing generalist. They obviously didn't know what questions to ask in the first place, wouldn't have time to get into the minutiae of 14 bikes if they did.
Nothing against anyone...this, imho, is best viewed as a classic example of what happens when you try marketing something in the wrong venue. For a collection of small bikes, it doesn't get much "wronger" than this :40: