I can understand and agree with the sentiment of what you've described. After all, I'm sure you have ends to meet and keeping an idea of time spent vs cost is important.
This is from a CB perspective, though I think it applies to MFC too.... One thing I may suggest keeping in mind though is that (at least from a member perspective) I think tokens tend to be thought of as something relative and less of a raw conversion to money. I think the nature of token sites kind of does that. For instance, when a member sees 'flash x' for 250 tokens, they're probably not thinking of $20 or $12.50 for the model. They're thinking 250 tokens, a decent sized sum comparatively speaking, but a bit disproportionately viewed compared to $20 or $12.50 (which imo appear less). The majority of viewers have seen other rooms and there is sort of an unconscious comparison between different factors of models, like attractiveness level / personality / price. Viewing tokens as dollar amounts tends to be done mainly at just buying the batch of them initially.
To be clear, I'm not saying the prices or logic you mentioned were faulty in anyway... it's just something to keep in mind for price-setting for the future.
Likewise, the more tokens relatively speaking, the more that will be expected. I.e. If a PM is 5 or 15 tokens, if I ask a question or two and then get ignored after, it's somewhat to be expected. The tokens weren't much-- the response isn't much. If I pay, idk, 200 tokens for a PM and then get ignored right after similarly (presuming it's not like a top-10 room with spending whales galore), it's going to be a little more questionable