The amount of ads, how often they appear and value of advertisements targeted to your specific profile is entirely dependent on the advertisers and will vary from day to day, even hour to hour.
Logging into your ClixSense account more frequently should avail more ads to you as you will find ads from smaller advertisers before they are consumed by other members.
ClixSense averages over 800 people logged in at most times. If an ad comes in that has 500 clicks available on it, the first 500 people who click this ad will see it. The other 300 will have to wait for other ads to come in.
Alternately if you elect to get our toolbar you can get instant ad notifications, a running balance and more. You can download our toolbar from the link on the left menu or from here: