FYI, $159 is a steep price. The ISO/ANSI-DE dolch GB is priced 117€ including shipping ( https://www.computerbase.de/forum/showthread.php?t=1601148 ), the GMK stormtrooper GB ( https://geekhack.org/index.php?topic=82240.0 ) is $100 plus shipping. i know, this isnt 100% comparable, but it gives you a hint how much the set really costs. If you do some price adjusting, im in!
Dolch and Stormtrooper both have 137 caps per set, while Terminal has 169. Stormtrooper was specifically noted to be a low-cost GMk set, while Dolch and Terminal come within $0.04 of each other on a per-cap basis, so like you said they probably aren't 100% comparable
I rely on your cap counts:
Terminal: $159 / 169 caps = avg of $0.94 per cap.
Dolch: $117.40 (110€) / 139 caps = $0.84 per cap.
Stormtrooper: $100 / 139 caps = $0.72 per cap.
Both dolch and stormtrooper have standard legends, no additional molds required. Terminal has custom molds, i dont know the price they charge per mold.
The difference is 22 cent per cap, or $37.18. As said, this math on averages - and always GMK quality.
Sorry about the Dolch price, didn't see that the shipping was included in the price so that skews price slightly, however, with custom molds I assume that cost is going to make up the difference. Also, not all GMK pricing comes out equal and there is always some variance on the per-cap cost. For example, I have included some recent sets, how many caps they included, their price and their per-cap pricing and they vary quite a bit overall:
GMK Monkey - 116 caps/$125/$1.07 per cap
GMK Skidata - 136 caps/$145/$1.06 per cap
GMK Hyperfuse - 124 caps/$115/$0.93 per cap
GMK 9009 - 140 caps/$140/$1.00 per cap
GMK Cyan - 118 caps/$122/$1.03 per cap
These are just a few I pulled up quickly, and compared to Terminal the pricing is on par or actually more expensive.