Thought I'd try V power.

[VNA]

It's not just about the RON number, it's about what else it's blended with.
Lead being the most commonly known, if no longer used, additive...

Winter fuel and summer fuel still have the same RON number, but are entirely different compositions.
The mix of short chain,long chain, branched, unbranched and aromatic hydrocarbons are altered to allow different volatility at different ambient temperatures so the engine can start, but still blended to ensure it resists knocking as well as the iso-octane blend it's based on once in the engine.
Then you add other components such as detergents to ensure injection nozzles don't clog and the like and it's a whole lot more complicated than not exploding quicker than 95% octane.

Sure but that applies to all petrol fuels. 

The question is if 92RON is recommended by Yamaha, is there any benefit in using 99RON.

I think the answer is simple - NO.