Of course, everything has to be made 'worth it', in order for it to be done. But, the only universal 'worth it' we can really say with any level of confidence is $. All other 'worth its' can be very subjective in definition, from person to person, even if we wanna comment on being worth it, in terms of resources.
Finite amount of resource in the world (the whole, the denominator), who/how/when/where/why/how much do each of us get for our share of that piece of the pie (the numerator)?
[hence, "sufficient" incentive to give part of our share away]
That means there's a value placed on the share, that there's even an ownership (chance for ownership), of a share of the pie....most in Africa don't even get that.