We can say that Google is different as unlike a normal pay per click ad campaign your advt will not rank high with adwords even if you pay highest amount as Google uses a factor called as Quality Score to determine the quality of your ad which in turns is going to decide the cost per click for your advertisement.
Higher Quality Scores will increase your impressions and lower your costs. Splitting ad groups, finding more targeted keywords and testing different ad text will improve your Quality Scores.
Thus aim to have a a high Quality Score and this in turn will help you to rank higher and you will be required to pay lower for the same ad with a low quality score video. have a look at below screen shot to understand that how quality score determines positioning of your ad coupled with pricing.