Better still don't bother with the insert and just concentrate on producing a good magazine. How many of us were interested in the insert anyway?
It would be interesting if someone did a survey on the take up of mags wrapped in cellophane/polythene v editions that weren't. I'll bet sales of unwrapped ones are higher. While I have some staple magazines buys (like Hornby mag) , I certainly review the others like BRM and Railway Modeller before buying. With Railway Modeller I check if there is saturation coverage of narrow guage or garden railways- if there is I don't buy, but otherwise I normally would. With the wrapping I can't tell