Read and read and read here Ken, you'll get a huge education in pricing and fixing up if needed.
"value" in anything is what the market will bear mostly. If you are willing to pay XXX dollars, that is what it's worth.
We get tons of threads here about picking up machines for next to nothing. That's great, I've been given my Singer 66 treadle, my 128 LaVincadora hand crank, and my lovely White Rotary blackside. Can't beat that price, but I was prepared to pay $100.00 for a good basic treadle. On the other hand I paid $300.00 each for my celery and black featherweights. Turns out I don't care much for Featherweights, so sold the celery and the other just sits under the table.
That expense gripes me
Welcome to the board