We (me and four of my friend) were playing "Flashpoint" for years. Today we are all "working adults" and I'm the only one who plays Arma. Why? My friends are of course still interested in a game like Arma. However, no one except me has a high end computer, but just good laptops. Each of them would buy the game immediately, if it ran on his laptop. The laptops are not bad (Think Pad Mobile Workstations, Price: 2100 $) and most games can be played, but Arma is virtually unplayable. If you scale down the graphics quality of Arma 2, the only thing you get is an unplayable "pixel mess".
Me and my friends are not interested in better graphics, but in a proper combat simulation and realism. I would even play Arma 2 with the graphics of "Flashpoint". Arma 2 is actually the only game where I would wish that it had worse graphics. It is likely that the same applies to Arma 3.
This is of course quite subjective, but I do not think I'm totally alone with this.