I am split on this...
Yes using a celeb will make people who may not normally watch a programme like this tune in, and hopefully become interested enough to get involved in someway, no matter how small..
But I also think it would be better to let a Normal person have the Oppertunity to have the Chance and experience of going to these places and seeing these animals.
After all if these celebs really care they can afford to use their own money to go to these places anytime and do their own Film if they want.
Also as i listened to them appealing for donations saying how little it costs to fund these thing, I wondered How much if anything do they donate from their own pocket ( always the Synic
)