For my $30,000 bike, outright grip is more important than mileage. My general rule is 2 rears to a front, especially if track days are involved. I would NEVER compromise outright grip for longevity.
The RS10 is probably the stickiest street tire available now with the fastest warmup. I have Q3s on my MV. The dunlops work great in the heat but are brick hard in the cold. The RS10 beats the Q3 in cooler weather and matches the Q3 if not provides more grip in the rear than the Dunlop, but at the cost of longevity. I'm partial to the Dunlop front because it doesn't fall into corners as fast and I like that for the street. On the track, I like the RS10 front but the Dunlop provides more 'feel'.
I won't even bother with the Michelins. ANY michelin for that matter. Ever since the competition caught up, they haven't been in it for me. I once attended a trackday and LITERALLY 9 out of the 10 crashes (90%) the riders were on PP3s. I had a set on my ZX7R and I absolutely hated them. Definitely not a confidence inspiring tire. .....you'd best have a background in dirt track because you'll be sliding those things everywhere.
I haven't ridden a Pirelli since one let go on me waaaaaay back in '05 or so. Never trusted them since so I have no data there.
So for me, for DRY weather riding, the RS10 is my Go-To tire. Once the Q3 finishes on my MV, I will put a set of RS10s on that bike as well. For wet weather, well, I simply don't ride in the rain.
In my humble opinion, if longevity is your only gripe about the RS10s, as cheap as the rears are (about $130), just go 2 rears to a front.
Of course no matter what you choose there is always a compromise. Yes agree grip is always more important than longevity but there is a limit! Bridgestone have always had the reputation for good grip and bad durability. Michelin the contrary ( certain models of course) have more grip and MORE longevity in my experience. Now that's what I am looking for !!!
Interesting what you say about the different brands of tyres you like/dislike. I am opposite of my opinions to Michelin I think they are the bees kness in superiority. I have had huge success with them at least as a street and occasional track tyre. To me they are leaps and bounds ahead as far as compounds are concerned, needing minimal warm up time to achieve high grip and confidence inspiring/feedback for performance riding.
As for my background I happen to have lots competition dirt experience as in Motocross, but those skills have been needed for other brands not Michelin.
As for Pirellis I totally agree with you, all the spills I had were on them. Dunlops mmmm they are ok had some success with the GPA,s on track but otherwise stay clear of them on the road.
I suppose the tyres we receive here may be different to the types you receive there, so perhaps that has something to do with it, but I think it just comes to personal choice in the end. Thank Christ we are all so different!
Have nice day mate