Which one was travelling first class? If they were, you should tell us.
None I've ever worked with have authorized business/first class travel. Most fly NGO rates. When airline staff find out who I'm working for, I am often offered free upgrades, which I more often than not decline. Most NGO and charity workers are very aware of the appearance of impropriety.
FWIW, I've also stayed in some incredibly nice hotels as a part of the job and in every instance, the room/stay were in-kind donations.
Seems to me you had 2-3 (?) negative experiences in high visibility circmstances that you might have misinterpreted and are using that to paint all charitable organizations with the same brush and are stating so in a public forum. I'm sorry your experiences have been negative, but that's not even remotely close to being fair.