I'm posting this on Steam for my own sake. This is just for reference and only for legendaries with a strict scrip value. For good legendary rolls, please price them accordingly.

Use x10 when you want your legendaries to move fast, price them x20 if you don't need them to sell fast, and finally price them x33 when they have some value or if you want them to sit in your stash for ages.

Here is the chart at a higher res [i.imgur.com].

I don't know if he is the OG creator of this chart, but thanks to SkeuomorphEphemeron who shared it on Reddit.