>>716086014LNs can also be written by a single person; maybe the editor and the illustrator have some input, but they are mostly one-man projects someone can work while relaxing on a cafeteria or on the park.
VNs on the other hand are much more elaborate even without taking into account voice acting.
You need a
>director>writer>programmer>illustrator>composerSometimes people can do multiple roles if they are talented enough, but often you have multiple writers (Scenario, specific girl routes), multiple illustrators (Character design, CGs, Backgrounds) and even multiple composers.
So you're doing this relatively big project with a team of people that require coordination, just for players to drop your demo 10 minutes in.
I guess that's why western VNs generally opt for royalty free music, ugly Daz 3D shit and such, since making a VN is a monumental effort for less returns than simply writing a fucking book.