I agree. Unless the sales figures are specific to the customer segment that received the email with sales from that vendor, the sales data is useless. All sales during the date range after a campaign are not attributable to that campaign unless the customer received the email and/or bought from that vendor.
Greg Scholand commented
We need to be able to set parameters for the Dashboard reporting. I currently have a promotion going for a specific vendor's product. I emailed all customers on our list, (6800+). I am now showing HUGE sales figures for that campaign which are totally erroneous. Any purchase any of those emailed customers has made is registering. We need to limit the sales figures to only items from the specific vendor for this information to be useful.