I'll throw in my 2c worth.
Most great artists that we revere from the past were not recognised in theior lifetimes.
Mosat great art is considered great because it shows two things togther
- a design that speaks to all of us, and a degree of craftsmanship hat allows the message to become clear.
I would maintain that art that speaks only to a minority, or indeed only to a single person - the artist himself - and is not exexcuted with any degree of craftmanship, will not become great - and indeed anyone who finds they have a paid a fortune for a shed full of it, might well be tempted to torch it in a falling mareket.