I have little to no issue with any of those conditions.
The cost of $100 toward application is on par with many other states. I paid total five times that amount including a $120 reg. fee in MA. And my VA CHP cost me in total just over $150. Being lower than $100 for an app. fee would be grand but it's not exactly exorbitant.
Instructors being state certified isn't unusual nor extreme either. I'd bet the Gunsite guys are NM qualified.
I've no issue with the age limit of 21 either.
I doubt they have a permit to allow carry of a knife. I know of no state, not even MA (yet), that requires a permit to carry a knife on ones person.
As to being toward a single handgun and not applicable or allowing a backup, that's a bit silly but again not exactly unheard of amongst states that support concealed carry.
As well carrying while under the influence of alcohol, drugs be they recreational or prescribed, and/or NyQuil is just a no brainer bad idea. Especially if said medication states on the side of the box do not operate heavy machinery while using this product. In such a case it's probably just as bad an idea to try to aim ones firearm on the streets whilst using said product.
I already censor myself to this end toward taking such meds prescribed or OTC and it's not due to law but good and reasonable sense.