Oh, MAN! I remember pretty much every single one of those ads. I'm not sure if I was still a Boy Scout in 1976, but many of the same advertisements ran over and over for years.
And you know . . . both of my long-time hobbies I first learned about from ads in Boys Life.
In 1970, when I was a cub scout, I was curious but skeptical about the adverts from Estes Industries and Centuri Engineering. I had had toy rockets that ran on compressed water and baking soda & vinegar, but they were disappointments. The Estes ad mentioned cameras and multi-staging, gliders, and flights to 2000'. I was a MAD magazine reader and primed to ignore wild claims. It took me finding an Estes catalog at summer camp to realize it was all true.
Then in 1974, Metagaming Concepts ran an ad for their new space wargame, Stellar Conquest. I think it was $4.00. I still have most of the set. It was incredible. It introduced concepts that you can find in strategic games to this day. (The original Masters of Orion was arguably an unauthorized clone of SC.) I found out about D&D from Metagaming's catalog, and made my first writing sale to their zine, The Space Gamer. (Although Steve Jackson may have taken it over by that time.)