though most of the art is sending a message. each person has different preferences.
for me art has to send a message/story but also be very detailed, where there is so much going on that it surprises you every time you see it by noticing something new, even after looking at it multiple times
this is a good example of what i mean about the detail stuff where lots of things are happening where you notice new things every time (the middle and right canvas's)

also i see a alot more effort and time and work went into these styles of art so id be willing if i ever bought art to put more money towards art like this compared to the simple "poster" format art.. but thats just my preference and thoughts
i know others like ones that are more 'poster' form where its a simple in your face message..
each to their own i say. art is for those viewing it. everyone has different tastes.
as for the 'simple message' format artworks i personally prefer the ones where the message is not a word format (like a poster) but using symbolic imagery using known common reference/trends.. EG

(note this is not commissioned artwork. its a quick mock display to show a demo of a message without words)