I was looking over KZ9's collection & he has about the same amount of stuff I had back in the late 80's(1983 to 89). Back then I traded 177 HotWheels for $3,000.00 worth of brand new train stuff. There was Atlas, Kato, Stewart, Athearn, Bachmann Plus, Bachmann Spectrum & much more just in engines. I had 60 diesels, 15 steam & some electrics. Then there was 365 pcs. of rolling stock & everything had kadee's. Everything was in the original box packed w/foam. Then there were stacks of books, track & scenery stuff. This guy had been collecting this stuff for many years. He had a giant walk-in closet full.
Then in about 1989 I bought out a closed hobby shop. There was N, HO, S, O, O27 & G scale stuff. Mostly buildings & some more rolling stock. I went to a train show & sold everything except the HO scale & tripled my money for what I paid for it. I got about 35 kits for mine. Another 16 Con-Cor passenger cars. Then in 2004 I bought a giant train layout w/all rolling stock & stuff. Paid $150.00. There was 2 cases of Atlas NS flex sealed up, 8 cases of cork roadbed, a MRC 9500 transformer & 3 other MRC transformers all new in their boxes. Plus I got about 25 buildings all new & unbuilt.
In 2006 I bought 15 boxes of HO scale train stuff & almost all of it was new for $75.00. A friend sold a bunch of mint Lionel catalogs from the 30's that were in those boxes for about $2000.00 on Ebay.
Now, after all these years I'm trying to sell my accumalation. I will be 72 yrs. young this year & me & the wife are getting rid of stuff by the truck loads. We've had 8 garage sales in 3 years & sold a lot.