"You can play ttrpgs for free, so spending $150 on them is a great value!" 
It's relative. Compared to some other hobbies, $150 will not be a lot. But compared to what you actually need to play ttrpgs, $150 is pretty expensive.
We're a hobby that loves its premium collector's editions and its stretch goal add ons and high end DM screens and custom dice sets. Relative to other hobbies maybe that still doesn't add up to that much. Within the context of ttrpgs, however, it's very peripheral and extra.

It's relative. Compared to some other hobbies, $150 will not be a lot. But compared to what you actually need to play ttrpgs, $150 is pretty expensive.
We're a hobby that loves its premium collector's editions and its stretch goal add ons and high end DM screens and custom dice sets. Relative to other hobbies maybe that still doesn't add up to that much. Within the context of ttrpgs, however, it's very peripheral and extra.