I don't know how the calculation for Rep Bot works (is there a web page?) but hearing mention of 10K vouches leads me to understand that the experience of the voucher is part of the equation. My question then is whether the reputation is dynamic, ie. if I vouch for someone, does their reputation change as my experience (and own reputation?) changes? If not, does that mean that I'd be of more benefit to the people that I favour by unvouching and revouching every so often?

Ah, thanks for the tip about the "help" keyword, I only knew what 3DFibs gave me. I'd thought that the formula was more complex than just the sum of experiences, ie. that it took the reputation of the voucher/complainer into account too.

The formula info didn't mention it being dynamic so I tested it with someone who I vouched for a while back. I asked for their rep, got 12356, withdrew and asked, got 11940, then revouched and asked and ended with 12583. That resulted in a boost of 227 so it looks like you can top someone up every now and then!

Ah, now that's an interesting page. Thanks.

That's a decent theory regarding making the reputations dynamic on a daily basis. It makes sense if the processing demand would be too high in keeping track of all changes to everyone's experience and recalculating the reputation value on every query. Without knowing what the load on RepBot is it's hard to judge that but the proof of the pudding is in the eating and the best way to munch a spoonful of that pudding would be to check a reputation for a couple of days in a row and see whether it's changed. Having been curious about it all I have been checking mine at various times over the last few days and, while I haven't written it down, I haven't noticed any change since the last complaint (I'd like to say vouch there, lol, but I met a sore loser. Doh!).

PS I've now found this: Alef's old webpage guide to repbot

Thanks for finding that old page 
I retrieved it and placed it at http://www.fibsboard.com/repbot

I thought i got all the archive stuff out of there but apparently not.
I fixed the page and the link to the forum.
Thanks for mentioning it!