It is a fact that the bullet lube the manufacturers put on lead rimfire bullets has a lot of influence on accuracy. As the old saw goes, rifles are individuals and have their preferences. One of my sporter-weight rimfire rifles showed a marked preference for Wolf Match Target ammo and usually gave me half-inch groups at 50 yards or better. I was surprised to learn that after firing several groups with the Wolf ammo, I could shoot much cheaper ammo and get similar groups until the Wolf lube was shot out of the bore...it seems that it usually took around 10 rounds or so for that to happen.
Anyway, I think this is one of the main reasons for not cleaning a rimfire rifle. For my part, I find it difficult to put a rifle back into the safe before cleaning. I don't mind firing 5 or 10 rounds for fouling the bore next time I shoot because shooting is FUN.