Yes, the proliferation of common and amateur artwork does justice to the professional and revered creations of past titans of art, because art is to be enjoyed by all who can experience it. The fact that art is so available to us now raises an interesting question. What is art? What makes it good or bad, and who is the appropriate person to decide? Salvador Dali would appreciate that discussion
The proliferation of common and amateur artwork on websites such as deviantArt do not do injustice to the professional and revered creations of past titans of art, such as Salvador Dali. This is because people such as Dali are reknown and the museums that host their works make a great deal of money.
deviantArt and other websites that allow artists of all skill levels, ages, and inspirations to share their artwork with the world provide us all with greater opportunity to see the work of creative people who may otherwise have passed into obscurity. When Salvador Dali became famous - he was a chosen artist promoted by a few galleries and critics, a filter that used to choose for us what was and was not great artwork. Now that filter is gone - we are exposed to more artists, more work, of more variety and we are able to each of us choose what we love. We are able to buy directly from the artists without the intervention of an agent, a gallery, or a critic deciding that this art should never be seen because it doesn't fit into what they may think is "good". Artists websites like deviantArt and others give artists the opportunity to bring their artwork to the world market for critique and buying in the same way the proliferation of Amazon Kindle Direct Publishing and other direct publishing websites are allowing writers who were turned down by the big publishers to discover an audience and find success.
No, putting these common and amateur artworks up on websites like this page is not doing any injustice to the professional works that have been put up by really famous artists of our day. I think that nothing is hurt by putting up peoples artwork that they want to show off.
I do not believe the proliferation of common and amateur artwork on websites, such as deviantArt, do injustice to the professional and revered creations of past titans of art. These works are not really comparable to past artists works because they haven't had the time to attain that status. Much less, I don't think you can compare Dali to most on-line art.