True, but a hunter could bring in "12 bucks" in meat and hide in one season and pay for that rifle, making it a very worthwhile investment. No coincedence that the term "buck" came about. And you wanted something accurate enough to take the head shot, so your hides fetched a premium (though I do not recommend headshots, I'm not a professional hunter and don't care if I put a hole in the body).
I never heard the distinction that a plain rifle went for half. A musket went for about $7.50 when a rifle was going for $12 in 1780. The metal in the barrel is where the money was. The pretty stuff served as advertisement before billboards and TV for the smiths. No self-respecting smith would sell an ugly gun. People were probably more appearance conscious then than we are now. Look at the heavy clothes worn even in the summer! These folks were insanely appearance conscious. "Poor boy" was an insult, not a term of endearment. If it could be avoided it was. My widowed sister-in-law scratched together enough to raise four kids on her own. What is THE FIRST THING her youngest buys when he gets his first 40 hr. paycheck? Nice clothes. You just get sick of looking poor. And it was a smart buy. Appearance is what gets you better jobs, better treatment, better friends. Works for birds, works for humans. That's show biz, kids, and all the world's a stage.
Craftsmen of the day worked in wood, metal, glass or clay. The latter two aren't much good for guns. So, you want a cheap gun you find some parts and go to the local cabinet maker or the furniture maker, or the gunsmith might have his apprentice or indentured boy work at it on the cheap. But when your life depended on it every day you would not want the cheap stuff.