profitableness
  有益;有利
  Prof·it·a·ble a.  Yielding or bringing profit or gain; gainful; lucrative; useful; helpful; advantageous; beneficial; as, a profitable trade; profitable business; a profitable study or profession.
  What was so profitable to the empire became fatal to the
  emperor.   --Arbuthnot.
  -- Prof*it*a*ble*ness, n. -- Prof*it*a*bly, adv.
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  profitableness
       n : the quality of affording gain or benefit or profit [syn: profitability]
           [ant: unprofitableness, unprofitableness]