The easiest way to ruin a rolled jib is let the wind get inside it so it flogs its itself to pieces, a couple of turns of the sheets round the rolled up sail will won't stop this but it improves the chances of it not starting.
There arer several reasons why a few turns on the headsail roller will make the boat sail better.
Many yachts were designed without roller reefing. When it has been added the reefing gear raises the tack which shifts the correct sheeting position further aft beyond the jib track position. Reefing the jib slightly may shift the sheeting back to within range of the track.
Rolling the jib slightly may cover luff stretch on a well worn jib.
A smaller jib may set better when running downwind goosewinged in vatiable conditions.
A slightly rolled jib may help ballance the boat better.