Yapta will continue to track the price of your ticket.  However, to recieve only alerts that are relevant to a purchased ticket you need to change the status of the ticket and add a purchased price.  To change the status of your ticket to purchased:

* Log into your Yapta account
* Select the Trip that contains the trip you want to edit
* Click Flight Actions dropdown
* Select Enter Purchase Details Purchase Price
* Enter purchase price and confirmation code (optional)
* Click "Save"