Outdoorzy.com co-founder Wade describes his Kilimanjaro ascent, with an aside about how much to tip guides, porters, etc.:

I’ve read some horror stories about tipping guides and porters. Also read that some of them turn around and sell all the flashy outerwear people give them after their trip up the mountain for cash and continue to guide in their old clothes.

Here’s how you know you’re dealing with The Real People of the Earth: They’re the kind who ask themselves: why would I wear expensive shiny new clothing through the jungle and to the top of a mountain, where it’ll just get all filthy and beat up?

Wade also dispenses advice for would-be Kili hikers on a thread at his site. (Hint: leave your liberal guilt at home if you want to have any fun.)