I would "guess" the percussion would sell, and be in use, at least 5:1 over the flintlock.
I have no data to base this on, just observation. It seems that here in the Northwest the flinter has fallen from grace, even more so, in the past five years.
I would also guess, from what I see at the range, that the in-liners have captured the imagination of our younger shooters, who lack the money to own more than one ML, and may in fact be the most dominant ML seen on the range since hunting season is coming up.
I also think the majority are there for all the wrong reasons.
Truthfully, I wish it were the other way around. But I have no say either way....I just look, listen, and wish.
Russ