Personally, I couldn't give a crap and a half about how much art is worth; art is near worthless monetarily in my eyes. If someone took one of those weird-ass Picasso paintings and added an X-Wing or an ARC-170 to it I'd be delighted. Hell, I'd buy the Picasso and give it to them to mess around with.
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My point...
It all depends on what you like. I have a deep and irrational hatred of famous works of art but I have a deep respect for any artist who can make a realistic rendition and/or a surreal interpretation.
While I feel the same as you do but towards modern 'art' anything done by someone important to you is going to naturally have a higher value than something done by some long dead or even living stranger.
I'm not sure how to differentiate "modern art" from "realistic art". For example, those Renaissance-age paintings of the Last Supper and whatnot are pretty good. They might not be top-notch in terms of capturing the realism of what a face actually looks like, but it's a fair rendition of a scene. I'll pay a few bucks to see them. I won't pay money to see art that looks like someone welded scrap metal together, vomited on canvas, or painted while on drugs. I'm very much for art that looks like something other than a vision brought on by substance abuse and insanity.
Modern art would be like that canvas painted solid yellow that sold for some extreme amount of money a few years back. I for one prefer depth, either a landscape or something man made and abandoned.
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My point...
It all depends on what you like. I have a deep and irrational hatred of famous works of art but I have a deep respect for any artist who can make a realistic rendition and/or a surreal interpretation.