Of 17 campaigns director or coordinator posts advertised through the British Overseas Network for Development in the past six months, three have been advertised again within two months, one has been restructured and two remain open.
"Campaigning doesn't have well-trodden career pathways," said Charlotte Imbert, acting general secretary of Bond. "Campaigners are activists who don't particularly want to go into management. Not many want to help others to campaign - doing it themselves is their lifeblood."
Jonathan Dearth, director of campaigning recruitment consultancy The Right Ethos, said: "Personal ethos is more important in campaigning than in other parts of the sector.
"Finding people with the right political motivation - and it is political motivation, because campaigning is about change rather than charity - is hard."