basically, by the time you hit 60, you will have like 20 abilities maxed out. so don't worry too much. but i reccomend ignoring duelist flurry, bait and switch, whirl of blades, they are quite useless
the point of a talent tree as an INGAME MECHANIC is for ppl to theory craft and try new things, NOT TO BE PUNISHED WITH A FEE EVERYTIME THEY PLAY THE GAME. may as well add a subscription if they want people to take teh game seriously, with this rediculous cost.