So I have been looking at Janis Joplin autos and there seems to be a big spread in value. One for like $300 to $6500. Is that really the spread or anything under say $4000 is fake? Or does the content eg. signed album or ticket stub has more value over other items. I am new to collecting higher end autos and don't wait to make the same mistake with the fake Beatles/Elvis autos. Thanks