Look at your impression share lost due to budget. You can do the math to calculate how many impressions you missing. Impression share(IS), plus IS lost due to budget plus IS lost due to rank will always equal 100% (+/- 1% due to rounding) Google doesn't tell you "limited by budget" unless it is. If you're smart, you'll use this scenario to your advantage. If you have good conversion tracking and you are getting at least 15 conversions a month, then going to a max conversion strategy is smart. If you don't have conversions, then use max clicks to get more traffic while you figure out who you're not conversions and what you need to fix so you can conversions.