Recently I collected a ton of raw materials (like 2k+ each except for jewelry) and refined it. Based on the obtained results and current prices for refined and raw material, I made a simple calculator that can be used to calculate is it worth to refine material or better sell it as raw (for 160CP materials).
For now, on EU PC, it is worth to refine only wood, totally not worth to refine leather and almost zero profit from refining ore and cloth. Also, you got like 8.5 refined items per 10 raw items (to know, how many raw mats you need to collect for a specific purpose).
Excel table available via the link on google drive.
I protected some cells so you cannot accidentally change coefficients, only current prices. Password for protected cells is "ESO raw" if you need it.
If any question - ask here.