You can get a lot of impressions for 160K. You buy them in batches of 1000 using a term called CPM, which is cost per thousand -1-. CPM can be around 10 dollars for a really good segment. I'm sure there there are some adops folks that have a better knowledge than me. So, if CPM is $10, then that gives you around 1.6 million impressions.

-1- That's right M is for a thousand, because M is a thousand using Roman Numerals. You thought you would never have to remember that.