I was just about to bring this idea up to ahrefs as well. As every month we have this limited credits that get used up and we can't even look up data for previous searches. It would be great if ahrefs can do a roll over of unused credits to the next month and let us look at previously searched data.

It would definitely make it worth our money. Doesn't seem fair that we get charged every month even when we dont use up our credits.