Scrap that you collect or keep for yourself?

I generally keep stuff worth way more than scrap value... At my shop any old bikes (20+ of 1950's and earlier), copper fire extinguishers (have 10 now), old browning cameras.... My list goes on.. Generally I google it to find a value of what the item sold for... If it makes since to hold it I do. My theory is once these old irreplaceable items are gone I will have some yo keep and sell... With the economy I am finding people scrapping most anything to get money. they want the quick cash instead of waiting to sell on ebay or Craigslist.