i sell 10 .380's for every small revolver. The big reason is because the new generation plastic frame guns are much smaller than the revolvers.
This is why I own, practice with, and carry a BG 380.
Now as many of us know it's not real hard to carry a bigger gun like my .45 SIG or my Glock 19 but many people don't want to put forth the effort to carry a larger handgun or they are like my nephew. He's a traveling salesman and he has to observe something I don't called a "dress code" so he can't wear untucked shirts or what i call cover clothing...
Dress code isn't simply a matter of compulsion, implying that the only reason people wear clothing in which gun concealment is difficult is because they are forced to do so. Some of us choose not to wear large, loose clothing at any time; it's not our personal dress code. In the winter I tend to wear long sleeve T's and sweatshirts. In the summer I wear shorts and T-shirts, and I do not presently nor do I intend to begin wearing a second shirt over my T-shirt just so I can -stick a gun in a holster. Also, I try to wear clothing that actually fits. I don't care for big and baggy clothing.
Body size plays into this as well. I'm 5'11" and 160 pounds on my way back to 150. If you're large and shaped like a lumberjack with broad shoulders and a small waist, perhaps concealing a gun inside the waistband is easy. If you're fat (and my trip to the local gun show last Saturday told me that this is an *epidemic*) then perhaps you already wear gunny sacks designed to cover your rolls. (I kid. I kid.) In such a case, concealing a larger gun may be "not hard".
But when you look like I do ("narrow" doesn't adquately describe my shoulder width), concealing a larger gun isn't easy unless you wish to change your entire wardrobe, and I don't. I recognize that this is a personal choice, that I could change my wardrobe. But many of us chose a semiauto .380 simply because of the tradeoff between its size and the caliber. I only pocket carry. Period. I'd *rather* carry an M&P9c, but I'm unwilling to change my clothing so I can stick a gun in my waistband so that nobody will see it.
This dovetails well with the OP's explanation of why he stopped carrying revolvers for semiauto's. It was his *preference* and while there are pro's and con's on each side, he chose as he saw fit. So it is with concealment. If your highest priority is to conceal the largest possible gun, you will dress and act accordingly. For many of us, the priority is to have a gun in the highly unlikely event that we will need it, but not to change how we dress to accommodate the gun.
Regarding revolvers vs. semiauto's, I considered a revolver before buying my BG 380. In the end, I chose the semiauto because it is slightly thinner and that's what I wanted.