Such a tough topic to agree on and I think ultimately you'll have to find your balance between cost to produce and what your specific clientele will pay.
I always start my pricing strategy with this formula. (Cost of materials + labor) x 1.25% (profit). So if my materials cost me 50 and it took me two hours (pay myself $20/hour), then my base is $90. Add in 25% profit and my minimum to charge is $112.50. From there I can adjust as needed and I can also tell immediately if this specific item is something I want to dive into as a permanent listing. Meaning, if $112.50 is what I need to charge for something to keep all metrics happy, but the market says it's a $25 item, then I scrap the idea and move on.
Good luck!