I actually record the wait stats on my main OLTP instance into a special DBA only database and reset them every hour. After about 2 and a half years at my current job the table size is only about 26 Meg, and it gives me very valuable information to understand the times of day that the server is under the heaviest loads, what the bottlenecks are at different times of day, different days of week, gives me a baseline to be able to analyze if waits are getting worse, and gives me insight to plan when good times are to add new processes or do maintenance to the system are.