Maybe the bar band Raspberries held to your thought, but at that time when they arrived, they were glitz and schmaltz. Sure I was 17 and filled with my ideas of good and bad in the music industry. But it was easy for me to discern. The Raspberries had their heyday more on top 40 AM Radio. If you were into music, you listened to AM only cause the omnipresence of FM radio wasn't. It was rare to see FM in a car up to 72. So I heard them. My biggest dilemma was 3 dog night, they seemed teeny bopper, but I embarrassingly liked them. Incredible vocals and the live at the Forum is evidence of everything for them. Raspberries didn't come close to to 3 dog night except for lady attraction. Acts in the 70's had corporate influence sure, but they didn't control the Doors, CSN, Zepp,Bowie and most of the bigger name act I cared for like they wood the Rasberries or similar type bubble power pop. Now excuse me,I am going to my corner and receipt some Karen Carpenter lyrics. Yeah yeah Yeah , I know, they wee great. Again, for me I resented this fluff type stuff and comparing it to the more sophisticated music like the Beatles, Kinks, Zepp whatever, their praise was unwarranted in comparison, only fluffed by the corporations or producer moguls. If they were boot strappers as you say, they lost that moniker during their first 5 minutes of fame.