FTP'rs HAVE to buy extra quick bars? Who told you that? A FTP'er is given, for free, two quickbars. I have played since Beta and can tell you, that although 4 bars are convenient, they are not necessary. Actually, if at any point you find yourself REQUIRING more than 2 bars, than you are playing SWTOR incorrectly. I agree that more than two is convenienet and a niceity, but two is really all you NEED to play.
When BW first announced the FTP restrictions, the FTP'er was only going to get one quickbar. At that time, I was on your side of the argument, as only having one bar would pretty much make the game unplayable before a person would hit 50. BW adjusted thier thinking, now you get the needed two. If you want more, then just pay the $2.00 bucks for the convenience of them.
They get two and have to buy more so YES they have to buy more toolbars learn to read.