Earlier quoted context omitted.
That's certainly a logical opinion, and I agree that efficiency is key. However, I think it's also important to keep in mind the personal value of traveling on aid trips, which allow for an improved understanding of the need that lies. Perhaps this encourages potential donors to increase the frequency and quantity of their contributions.
I'd liken it to the classic criticism: "charities spend too much money on advertising!" But how do charities get donations without advertising? How do they let people know why they need the money and encourage them to donate? At some point, yes, a charity can spend too much of its donations on advertising, but advertising in general is a necessary evil. Same with this. The charities might take in less overall if they…
or non-good, marginal good, regular doings, etc.