During the busy season I will put upwards of $500-$600 a month and then in the very busiest times (right before Christmas for my retail products) I spend around $50 a day. Over the entire year it averages out to be $200 a month.
---------------------------------------- I usually put $10/day for 30 clicks, and let it run for months if it is a winning campaign.
Too much money lol. I put everything i have into PPC marketing actually. So i'm broke by the end of every month.