I'd say there's a price for everything.
When you sell as a lot, you know you will not get the sum of the prices of all individual items.
When you pick random stuff blindly, you can't really assume anything more than the minimum.
85 common games with some boxed = about 50$
Boxed unworking trackball = 10$
Empty 2600 box (some people seem to not care about serials so you can always sell that with a random system) = 5$
My first offer would be 65$, and my max 75$. Over that, it's a risk I would not be ready to take for a lot I can't see before making an offer.