See, I don't think this line of thinking is technically wrong, only inherently. I believe players that ALREADY are involved in 40k, have an army and enjoy will absolutely buy models based off of aesthetics. However, if you are looking to get into 40k or have become very disenfranchised with how the game is currently playing, then you aren't going to buy any models. Here's how I see it and I think (but can't confirm most certainly) a lot of players see it. If you don't have a good game to back up the pretty models, people aren't going to buy them.