Well, times change. Prices are worth what people will pay for them. Out of curiosity, is it possible for chins to reach a price where they aren't profitable enough to hunt (compared to other alternatives) and yet still be too expensive to buy?
That's not a fine demarcation. You're always going to have some small % of people who want to use chins for fun, regardless of the efficiency. And then you could have chins being efficient range xp for only a super small percentage of people, so that you could say they're practically without a use. So if you set a hard number, like "is it possible that for 99% of people chins aren't profitable to hunt, and for those same 99% of people chins would be too expensive to buy," yes that's very possible. For 100%, you'd have to have at the very least chins be strictly dominated by another ranged training method, and also they'd have to be not that profitable to hunt. Of course, the strict domination would lead to the second condition. (Where strict domination means that that from x-99 ranged, there's always a method that's both cheaper and faster than red chins, where x is whatever you need to use red chins)
"I also wonder, from an efficiency standpoint, could hunting chins be worth it to combine hunt exp with saving on chins?"
Of course, the standard efficiency formula would apply here for anyone seeking hunter xp. (set up equations for ( hunter xp + money)vs time, then plug in money = income rate * time, to obtain solutions in terms of income rate, to show which ranges of incomes should use which training methods)