I do see your point, I guess it would make sense if you don't do alot of riding, but for me, I put 53,000 miles on my '04 1k and I ride hard. I want a chain that is going to hold up. If I were running a 520 kit on the street, under those circumstances, I'd be broke and wouldn't have been able to afford my new k7..
For what it's worth, I buy the most expensive DID chain and run them for 20,000 miles. I never adjust or clean it unless I needed a new rear tire, I adjust it, but still never clean it. I replace them after 20,000 just because of the abuse and neglect I give the chain. But they hold up well. I ride... alot... And the added benefits that a 520 will give is nowhere near justifiable for street use. Not on a liter bike. And most of the guys that are changing, most anyways, cannot ride hard or fast enough to notice a difference between a 520 and a 530. If you have never even done a track day, then I know you don't need a 520. Someone please show me the benefit for it on the street. Waste of your money. For me anyways.. :cheers