Adwords have something called... 30 day budget... which calculates, depending on the whole amount and max cost per click. Anyways what happens if I decide to change that every 3 o 4 hours after getting clicks? For example... If I set it @ $100 per month and then $500.00 after a few hours then back to $100.00 after getting clicks? I Think that the more you put the more the more impressions you get.
this would make sense, if for example you're budget is $20 and you've spent $18 obviously they'll show your ad less in order to avoid going over $20. I usually control my budget via the amount I pay per click, so if google goes over my "budget" at the prices that i'm paying that is fine with me. I set the per click values to where I'm happy with unlimited clicks for the cost and I set my daily budget 10 times my usually daily spending.