We have just got rid of a lot of stuff at 4 successive Boot Sales.
The key to successful boot sales is choose your stock. Do not bother with clothes or toys. There is a surfeit of both at all boot sales and they do not sell unless you practically give them away. If an item would be accepted by a charity shop, it will not sell at a boot sale and should be donated to a charity shop.
Boot sales are for all the things that charity shops do not accept. We took garden equipment, stuff from the garage. DH came up with the idea of a 'rootle' box. A big plastic box full of random things from the garage , small tools, packets of nails, flanges and brackets. Men adore rootle boxes, they were all queuing up to have a rootle and things were flying away at anything from 50p to £1.
We took stuff that worked but was slightly damaged - an electric fan with a dent in the base. A lot of what we took quite frankly one would classify as 'rubbish' but it sold.
As I said, we did 4 boot sales, we cleared between £40-50 at each sale, £10 for entry, £10, for bacon buttys and coffee, (we had to be on site by 7.00am.), so we cleared around £120, from 4 sales, but we were not there for the money we were there to recycle and reutilise all sorts of old rubbish that would otherwise end up in a skip at the tip - and in that we were very successful. We stopped doing thm when we ran out of stock.