Of course, you can believe what you like, even though it seems to me that categorizing of all value as subjective comes off as a wee bit whimsical and out of touch with other  ways that value can be assessed, since it seem that something has to actually have value in various objective ways in order for the subjective valuations to potentially complement the objective valuations.. and sure sometimes humans may get the valuations wrong or have to re-evaluate why they might value something relative to something else, which again I would superficially without getting into a bunch of nitty gritty to have both objective and subjective components depending on the asset, good and/or service being valuated.