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I don't think they do offer discounts, they'll probably just absorb it in their management fee instead. Google does have a partner program where you add budget in bulk, but I haven't heard of discounts

http://www.google.co.uk/intl/en/ads/premiersmbpartner/partners-details.html#eligibility

I have a search term that is only used widely for one month of the year (roughly) - that keyword is "ucas clearing" only really used in august.

Looking at google's keyword tool it shows a monthly search figure of 22k and apparently this is the average across the year. Now, do google add up 0,0,0,0,0,0,0,264k,0,0,0,0 - divide by 12 and come up with 22k  - or do they see that it isn't steady traffic and just ignore the 0 months and therefore 22k is actually about right?

Many THanks for confirmation,

Ally