Why am I supposed to have just one style, as an artist?

I paint, draw and sculpt using different styles. I have always done this way. 

For the Art Market, it is bad. 

So it goes.

But I think - and hope - things will change, becouse styles, in art, today are becoming just languages. The content of an artwork (the content, not the meaning) is what is going to matter more and more. The content, not the language. 

Of course, that content can be a hoax. It could be. It happens. I don't care.

(I think @arthuradamson can understand what I mean ;) )