As the owner of a vintage store specializing in Mid Century Modern(MCM), here's my two shiny pennies.

Mark's artwork is reminiscent of Charles Eames early illustrations with a new slant. Because an artwork has mass appeal doesn't mean it's "crap".
While I prefer MCM era originals, there is definitely a huge market for MCM style design with a 'superflat' bent.

Also you have to take into consideration that MCM originals are out of financial reach for many, and so Mark's offering a good looking print that appeals to SHAG enthusiasts and people looking to avoid IKEA Mass Market Crap (Yeah I said it). It's a good choice.