One trend I've seen in valuing an item, and I'm usually on the wrong end of it.....
I was doing well with the old hand meat grinders. Universal 1's from early 1900's.
Was getting them at estate sales for $3-$10/ea. We're very few on eBay, etsy and none on CL.
I was selling them within days for $20-$30.
Month later.....
eBay was full of them, etsy has 20-30 listed and local CL has 2-5 listed a week.
Think everyone saw my listing and said "hey! I have one of those".
They saturate the market, then they start to lower price....old 'supply & demand' model in effect.
Anyway, I can hardly give away meat grinders now. But others still have them listed at $30, week-after-week while a million more list at $5 and still not selling.
Sure it happens on other items but in vintage kitchen ware (which is my primary thing right know) I see it happen all the time. Especially on CL and etsy.
I've been lucky and got in at start with the grinders and few others (that you'll have to forgive me for not mentioning cause prices haven't totally dropped out yet
). But most times I'm selling items for $5-$10 that are listed all over for $30.
And found that no matter how low I go, if there is 30+ of the same item it doesn't sell. They could all be listed a $100 and mine $1 and nothing.
Some categories people want rare. If there is a ton listed they either don't want it or figure why now, they can get it anytime so......
And with that I see I totally left the path of what I intended to post....
Oh well, still a touch on topic....kinda....