Yeah, that's definitely a plus, but.... cash shopping is much more expensive than the cost and monthly fee of a game in the long run. Having played both PW and Runes of Magic and Rappelz for quite some time over the past few years, I can say I probably spent more in 3 months time than I will have spent on Aion or WoW for a year lol (yes by choice sort of, but you know how them cash shop things are and how they love to put almost essential items in them to make you purchase lol). They are nasty them cash shops, and they are devious in how they work, always making it seem like it's cheaper than the pay to plays, but in the end they are way more expensive.
Granted of course, that is only if you are a cash shop user, and you can be assured that at least 75% of players or more, are users lol.