Rollover credits for all subscriptions

To be honest, I think unused credits should rollover for all subscriptions. I personally think, I purchased these credits, so why should they expire at the end of the month. Most will run out of credits before the month is up, but I, for example have a job, a family and health issues. If I don’t have time to use all my credits until the months ends, it would suck. If I get sick again and end up in hospital, the credits are lost too. I think it’s a bit unfair, to let purchased goods expire. I get that you need money to keep going, we all do, but please, think about it. It doesn’t have to be for a whole year, but maybe for two weeks or a month would certainly help.