Also i think maybe some of the metals like titanium, adamantine, etc... are way too expensive and very hard to earn enough money to buy them. Maybe you could make them cheaper and/or make the "players" give you more money for the weapons. I really love this game so far and just finished playing it for about 6-7 hours. I got to day 23 and it gets almost too fast for me. A couple "players" left because i couldn't go fast enough, but still a very good game for a work in progress.
You say that titanium and adamantite are too expensive, but they're actually much quicker to upgrade to then the second metal, tin.
With copper at 10$ and tin at $500, you need to sell 500 ingots worth of copper to reach tin. (not including grips/guards) After that, you only need to sell 20 ingots of tin for iron (at $1000), 50 ingot ofs iron for adelite (at $5000) and that cycle repeats. (Unless it's changed since I last looked.)
I understand your issue, I have it aswell. You need to sell an insane amount of copper tools to reach tin and it isn't purely based off the price of the ingot because you need to factor in the grips and guards, if used, in a part. And ontop of that the prices aren't as exact as they claim to be. The player card that indicates skill points, activated by pressing "P", shows that the base state of charisma gives you a 10% boost of sale prices for a total of 110% money gained from what you spent on making the part. However, if you look at the board on the left wall, inbetween the doors to your bedroom and the forge, it shows all of the prices customers paid for the parts and they almost NEVER match what the skill card indicates. Its still random, you can even LOSE money sometimes for no reason, the customers simply don't pay the right amount. I've had a customer pay $56 for a copper great sword, which used 3 copper ingots, a fancy 2 handed grip, and a 2 handed guard for a total of about $40 give or take, and I've also had the same sword sell for only $24.
It may be possible that the prices depend on how fast you give the items to the customers but I know for sure this system is properly coded yet. Which, in my opinion, is perfectly fine for now because it is still very early in development but it does slow down the progress tremendously and leaves money gain to chance.
Check that board for sale prices you get and monitor to see if time is directly related to the price of a weapon or not and let me know, I'll be doing the same. All I know is that I think the charisma state increases the MAX profit rather then the ACTUAL profit, for now.