When getting a major $$ deal on a car

I felt guilty giving a guy $40 for a Hemi Vertex magneto with 2 caps and some 8.8 hemi plug wires attached and a blower crank hub. Thats what he asked for it and I was fast with the 2 $20's. I've reached out to a few new members here and advised their sale price was out of line, either high or low. What good it did is unknown, but I'd hate to let a newbie squander a cash cow forn peanuts or embarass themselves on a $1500 stock slant long block listing.