At some point you'll have to gain some levels. Because no matter how many AA you have, if you stay level 10 or 11 forever, you're gonna get flattened some time, lol. Also, you'll get to a point where all your quest rewards will be too high for you and you won't be able to use them.
Yes, your experience bar shows all 3 types of experience - adventure, tradeskill and AA. Adv. is yellow, TS is purple and AA is green. Right click it and you will get the option to show a specific type of experience and you can lock the bar so that it doesn't flip when you change the type of experience you're getting.