I am a tad confused here... Is he saying, We can buy them (not true), or is he saying, "Maybe implement a system for which we can use AP has money, so that we may buy rank's, and Armartars."...
I think it should be obvious he meant to make this a query, not a statement.
In that case, no, I disagree. AG has a good, simple system that nobody will object to (that I'm aware of), so let's keep the rank and avatar system as is, hm?
I don't find it a good idea, I find it pointless and unfair for some users. It would make all the new users AP ambitious. There are more important things than AP.
As in a game a player gets weapons and powers according to his level and expirience, the same is with AG in which you get more accessories when you have enough AP..