Why is it so impossible to price old art?

I have 3 pieces of valuable art that I need to sell, each about 50 years old, but finding even a range of what they're worth is impossible!
I've already lost money on websites claiming they'll tell me what it's worth, and then never do after I've entered my credit card info and been charged.
What the friiick!?
I just want need to find out what they're worth so I can sell them!!
Any tips?
 
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