profitable (adj.)
- advantageous
 - advisable
 - appropriate
 - auspicious
 - banausic
 - becoming
 - befitting
 - beneficial
 - benevolent
 - bon
 - bonny
 - braw
 - capital
 - cogent
 - commendable
 - conducive
 - congruous
 - constructive
 - contributory
 - convenient
 - decent
 - desirable
 - effective
 - elegant
 - estimable
 - excellent
 - expedient
 - fair
 - famous
 - fat
 - favorable
 - feasible
 - felicitous
 - fine
 - fit
 - fitting
 - fruitful
 - gainful
 - good
 - goodly
 - grand
 - happy
 - healthy
 - helpful
 - kind
 - laudable
 - likely
 - lucrative
 - meet
 - moneymaking
 - nice
 - noble
 - opportune
 - paying
 - pleasant
 - politic
 - positive
 - productive
 - proper
 - regal
 - remedial
 - remunerative
 - reparative
 - retributive
 - retributory
 - rewardful
 - rewarding
 - right
 - royal
 - salutary
 - satisfying
 - seasonable
 - seemly
 - serviceable
 - skillful
 - sound
 - splendid
 - suitable
 - therapeutic
 - timely
 - useful
 - utilitarian
 - valid
 - valuable
 - virtuous
 - well-timed
 - wise
 - worthwhile
 
Revenge is profitable, gratitude is expensive.