Incentives for engagement include:

  1. Physical pleasure.
  2. Material economic rewards — short-term (~ cash payment) or long-term (~ tokens and equity).
  3. Fun, satisfaction and achievement; moral, intellectual or other.
  4. Professional reputation and social recognition.

They can be represented with a 2x2 motivation matrix:

Tangible Intangible
Internal Personal pleasure (e.g., enjoyment, physical comfort) Personal growth (e.g., satisfaction, achievement)
External Material rewards (e.g., salary, bonuses, equity) Social recognition (e.g., praise, reputation)