Welcome to the forum Teun!
You’re correct in your assumptions regarding ‘Plain’ rifles. While a good number of ‘Fancy’ rifles still survive, a large number of Plain one survive as well, but a huge number of the plain Jane’s were also just worn out and thrown away. While I don’t have any hard proof, I’d guess that plain ones were made by at least about 20 or 30, to 1 of the fancy variety.
Obviously most of the published guns are the fancy ones as they generally attract the most attention. Some of Jim Whisker’s books show a good number of plain rifles though, I just don’t remember which of his many books have them. Perhaps one of the other guys will remember?
Personally, I’m more attracted to the fancier Pennsylvania rifles, but still have a soft spot for some of their simpler brethren as well. And at this point, the plain ones are much less expensive to buy, as a pretty nice one can be had for relatively little money, but in the way of most things, the fancy one will always bring a better return on investment.
Also be aware when looking at the pictures of the fancy ones that not all of them were just wall hangers. A lot of them were used long and hard, and subsequently have had a good bit of restoration done to bring them back to their original glory! Most of the plain ones will be found in ‘as used’ condition.
A good way to further your budding interest is to gather a small library of different areas building styles, or ‘schools’ of makers. Jim Whisker’s books have a good representation of all the various areas of gun making. Although all his books are out of print, most are still available from sources such as Amazon or other used book sellers. George Shumways books are classics, as is Kindigs “Thought’s on the Kentucky Rifle”.
Collections and interests can be eclectic or focused. Maybe you’ll find yourself enjoying those from the south as shown above, or will more appreciate those from Pennsylvania, Maryland, Virginia, or Ohio.
You’ll find there’s a wealth of information here, so when you have questions, no matter how basic, just ask!
Again, welcome,
John