That only works for small that are easily shippable, but I agree that is the best way. We have done that with a few friends and advised them what items need to go online and what doesn't. But they have to sell for enough to pay for our time and fees a plus bring a return to the owner; we don't do $10.00 eBay items....
Unfortunately, that only applies to a small portion of the goods as much of it sad to say is basically worthless bag sale items that many already own.
Face it, we all have a bunch of stuff in out homes that has little resale value, ie tools, kitchenware, clothes, domestics, pictures, books, glassware and knick knacks are all common items that they are lucky to get dollar one for...