Some advice my uncle the antique dealer tried to give me 40 years ago, was to have fewer items, but better items. So when I collected coins, rather than having a pile of half worn out coins, I would have been much better off just having one or two top notch coins (easier to sell when you get out of the hobby too, anyone want to buy some worn out coins?). I remember him offering me a silver stein (I was collecting steins and mugs at that time, want to buy some?). He offered it to me at his cost, said it was a smokin hot deal. He told me "twenty". I said, great, I'll take it. $20. He said, no, $20,000. At that point, I stuck with the low end stuff.
When he passed away, a lot of his collection ended up auctioned off at incredible prices, such as $70,000 for one vase. He had some amazing stuff.
On bikes, I would be much better off consolidating into a handful of great bikes. We'll see if I finally take his advice.
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Please don't confuse ebay "asking" prices with "selling" prices. Many sellers never get their ask price. some are far from it. Value is determined once an item actually SELLS. Its easy enough to check SOLD prices.