Why would any of these things be significantly valuable in the first place? Glancing at the artist's [article on Wikipedia](https://en.wikipedia.org/wiki/Roy_L

Why would any of these things be significantly valuable in the first place? Glancing at the artist's [article on Wikipedia](https://en.wikipedia.org/wiki/Roy_Lichtenstein https://en.wikipedia.org/wiki/Roy_Lichtenstein ), it looks like some folks really liked his work and would pay a lot of money for it..? But, why?