Ok I don't understand you here at all. I AM addressing Epicurean doctrine, and taking the position that "natural measure of wealth" is no different that natural measure of courage or friendship or anything else.
well, I guess my initial reaction was that it sounded a bit dismissive. Maybe it was not. It seems to me that an argument for a natural measure of courage or friendship would have to be related to the canon (empirical / scientific studies) or to the concepts in LMenoeceus on our natural desires.
For instance, I argued that there's a natural measure of community, following the Philodeman and Metrodoran approach with wealth, and I based this on 1. studies on how isolation is bad for one's health (therefore friendship / relations seem to be natural and necessary for happiness and health), and 2. Dunbar's number (which shows that our brains are only able to process about 150 interpersonal relations).