Firstly with regards to improving an attribute or skill in any game I always insist that there is justification for the character to do so, regardless of the system.
With T2k I'm inclined to have just one pool for XP and to allow the purchase of skills as normal and attributes as the level you're going to squared, i.e. if you want to put an attribute up from 6 to 7 it will cost you 49 XP.
That will take a hell of a long time but it will allow players to improve relatively low attributes comparatively cheaply.
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