I encourage and implore all providers to rate their rigs at a true and accurate speed.   Based on the last 24 hour performance.  IE if your rig is hashing at a straight line of 2.17Mh/s you should rate it 2.15 or less.   Pool Swaps will bring down the 24 Hour a bit.   If your rig has downtime or hash-rate fluctuation you should account for that. 

The newest site build will encourage this.