Although I do not purchase expensive handbags, or expensive anything, on eBay, just for fun, gazing around the Grand Drawing Room that graces the stately several square foot townhome that is Puff Palace, I did attempt to guesstimate what I would have spent had I purchased even what hangs on the walls of one room, and the figure was quite astounding, and in a few cases, due to several factors of age, etc, not really calculable, at least not by me.
My little rug that I posted about in the good eBay experiences thread, if I use the seller's other rugs as a guide, ended up saving me about $1650. Which is a very good thing since I did not then and do not now have $1650.
On clothing items, I have calculated that on the average, I have spent about 10% of what I would have spent had I just walked into stores and pulled it off the rack.
For inexpensive bags and faux bling, it is harder to guess, since my eBay purchases in those categories have been almost exclusively things that I could not find in brick and mortar stores.
And when we get to the subject of my "babies," my one-of-a-kind hand-embroidered bags from here and there, we are back to guesswork that would be better suited to the notepad of a museum curator, not a humble Shimmapuff.