I have done this sale for a number of years. Last May (2019) I sold 113 sets for a total of $4100 . This will be the biggest one I ever do according to selection. 400 plus sets (120 different star wars) I have a reputation now as the lego guy but I am also the garage sale coordinator for the neighborhood so the press ads lead with Lego. I carpet bomb the neighborhood entrances with signs and provide ample direction to get to my place. I cover face book market place and Craigslist. The key, I believe is location, selection and pricing - I have the location (Troy, MI - suburb of Detroit well entrenched upper middle class, lots of traffic around the sub.) Selection - give them something so out of the ordinary from a garage sale they are overwhelmed. Once they get here it is no longer a garage sale it is a store and they treat it that way. Plus all the signs that say Lego priced as marked - no negotiation. Pricing, be reasonable - Look at eBay and take off some money for shipping and selling expenses. Don't try to get ebay prices (or Amazon) - Give the discount for buying from thew garage sale I still get idiots like the Craigslist guy who offered me $1200 for the collection I politely told him he was an idiot. But my ad says pricing is reasonable and how I price and put a disclaimer in there that you are not going to get a $100 set for $10 - that is not going to happen. Also, I sell nothing used - Damaged boxes yes but nothing that has been built or put together. Used implies discount. - I give no discount. I don't even open that door.