The Helpless Artist

I have found that many artists, take their art to the gallery, and that's it. I always wonder why, artists are not more proactive about getting people in to see their work, before the exhibition closes.
Many artists don't think of doing the extra stuff to get paid.
I hear to often the cliche, that it's the gallery's job to sell.
Well, surprise,nowadays with so many artists in the mix. Real artists need to go the extra mile.If they do , they won't be so helpless.