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For
@AtomicStorm, I would recommend Commercial Black Powder:
https://www.midwayusa.com/product/1022448878?pid=761750
If 1 pound will last you a lifetime, then commercial will be the best for you.
I can easily burn through 75 pounds a year in BP rockets, shells, stars, headings, lift charges, etc... Making my own BP is more economical. It is no problem for me to set aside a few grams for my rockets.
There is no need to make your own if you will never use it.
Personally, however, I find making BP relaxing and enjoyable. I believe it is a good skill to learn.
I can also start a fire with chert and high carbon steel. I use old Coleman equipment with pumps. I bake my own bread. I build my own rockets.
I do NOT make my own igniters. Commercial, even the cheap Chinese e-matches, are more reliable in my experience.
For most Rocketeers, Commercial BP is the best choice.
Zeke