The problems with yellows are just like reds and whites....theres a million different shades of each one of those colors and its really easy to get it wrong (in my subjective opinion anyway).
I had an 81 Jeep CJ-7 that I specifically wanted painted Corvette Competition Yellow. It took me a long, long time to find just the right tint of yellow back in the mid 90's when I was planning this project on this Jeep.
Then when the painter did the job, he used a different tint of yellow and it was so pale I hated it!! I made his shop do it over again, because it was way off from what I asked for. He eventually got it right and it was beautiful!
So yes indeed, Yamaha Competition Yellow is a tough one to get correct as well, I totally agree.