It's my understanding that mobs award a fixed number of exp points regardless of level.
Disregarding the racial and class exp modifiers which can be explained in the FAQ:
Say a lvl 29 mob gives 20,000 exp (unless it's trivial green con)
If you are lvl 10, 20k is a good portion of a level. (like dumping a gallon of water into a bucket)
If you are lvl 35, it still gives the same 20k, you just have a much bigger 'bucket' to fill.
Also: expect there to be a point where soloing dark blues is no longer efficient. Kika is right, at 60, a lvl 59 will make you a snack excepting rare circumstances like Low-MR mobs that can be kited.
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