Hmmm. Another way to see it would be that having a few months of issues might be a plus and incentive for a person to subscribe, which he might not have done otherwise. I'm not sure what kind of magazine you are planning to release, but mostly when I buy magazines, I'm not that interested in the old issues.
Hit me with an email - Holger@Uninkd.com - if you are planning to release a magazine, but this is a deal breaker.