I have seen a number of people 'sell it all".
I used to make 1/2 of my income parting out estates (not all the clothes and crap, just the single type stuff, and have done a number of quilt rooms) I charged on a sliding scale. today I wouldn't start anything for less than 20 dollars, no profit for anyone after ebay/paypal fees.
The ones who've sucessfully 'sold it all' at once take lots of photos, to show value and list them on Craigslist or local marketplace or state/regioin FB groups. . One bank check takes all. You won't get retail, resellers expect to get 50-60% of retail so need to by for 20-30% value to make their time and effort worth it.
I can share a lot more about ebay if anyone is interested in a ton of work, but you will get quite a bit back.