How do webots like spiders from search engines and affiliate programs like cj.com affect the bandwidth/data usage of a web site?

Search Engine Webots:
Obviously the go through the website checking pages, how many do they add to the data usuage? Is each page they go through like viewing a page?

Affilate PGMs:
They probalbly send webots to see if banners are active? Do they affect bandwidth/data-usage? If yes, how much?

Perhaps use as an example 1 banner per page which is 100k in size including html, pictures and banners.

What do you think?

Sure they do.

I have one site where nearly 20% of the bandwidth goes to search engine support.

It's a fact of being listed in all the search engines on the planet I'm afraid.

-t

It does, but it should be already counted in your web data transfer amount. It does consume a LOT of system resources however. :).