So lets take 1000 coins and your paying less than 1$ over spot so 17.70, thats still a pretty big venture of 17,700 right now, making a die so probably 200ish(x2 forgot two sides but the back side is very simple so cheap and the front could be more) so 18,300 and printing 2500. So we have a grand cost total of 20,600$ to at least break even you need to sell these at 20.60$ without shipping everything plus is profit (not counting labor) so we now have your price of 75$ so a profit of around 54.40$ a coin that time 1000 brings a nice possible profit of 54,400.
You're so far off in your estimates, it's apples to kumquats.
First, the pricing PDF you showcased is for their discounted minting program for Military/Schools/Non-profits, which obviously does not fit. The correct pricing guide would be here:
http://silvertownemint.com/Portals/0/PDF/custom%20prices.pdfSecond, back in 2014 when these were actually minted, silver was around $20/ounce, highs close to $30 depending on when it was bought, not today's price of just under $16. Add for each round over spot at least $1, plus the charges for the blanks which is $2.50 from Silvertowne. You're up in the mid-twenties at least already per round before anything else.
Custom dies can go anywhere from $200 - $5000 depending on intricacy. Let's take a reasonable price for the dies, say $1500 for the front, because the Gen2 design was more intricate, and $500 for the back. Pray you don't crack a die and have to re-create another set. Typically you'll create two sets just in case for that very reason.
Each round comes with a set of 3 holograms, which as stated were around $1 each, so $3 per round, or $3000 for the batch.
There is a fee for the actual minting run, usually $250 - 500. Not much, but we'll toss it in there.
Any idea how much it costs to package in capsules 1000 ounces of silver, then in tubes and boxes, and then ship it, oh, BTW, insured? Tack on another easy $3000. This is before any shipping cost back out to the buyer.
At this point you're up double what you initially thought it would cost. For just materials. No labor, no other incidentals for the process, not counting anyone's time. It's a far cry from the estimate you thought, and the profit margin has also shrunk quite much.
Oh, and this:
especially since this is the third design and everything is going smoother and probably better rates.
Dream on. There is no "smoother" part about the minting process. All the above is a hard, set price, no matter whether you're minting your 3rd, or 300th batch of coins. You get breaks on quantity of coins in the actual order, not the minting batch. Even at 10k rounds, you're probably only shaving off a dollar or two from the cost of the silver blank, if you're lucky.