[try_the_bass]

They could spend the same time and effort arranging blank slides creating the exact same thing without the pictures, and it would have far less value

The value does not come only from the arrangement of the pieces, but also from the pieces themselves. To say the only value comes from the artist is just as wrong as saying its only value comes from the source material.

A painter cannot paint a picture without a canvas, and yet the canvas itself is generally not free, with the canvas-maker earning something from the sale of the canvas itself.

The rest of your comment is wildly condescending, and while I am open to reconsidering my beliefs, I generally do not follow the advice of condescending people. My life experience tells me such people are generally both more close-minded and more morally bankrupt than those who can evangelize their beliefs without condescension. Perhaps consider changing your approach to providing unsolicited advice?