Sometimes I wonder what I've been missing with my stock suspension when on this board...but then again, I'm happy with my bikes handling and ride pretty aggressive according to others.
Can't imagine if I had more.
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Yeah you can, just imagine having more clearance and control so you could do those runs just as fast but without all your bike parts being on the pavement.
And...you could make a mid corner adjustment to swerve around something if you had to which is hard to do on stock suspension when you are already rubbing hard parts and can't lean any more.
I'm sure you are a great rider and you can ride plenty fast and agressively on stock suspension. However, doing so the way you are doing it uses all the bike's capabilities and you have much less reserve to tap in to if something goes wrong. In a controlled environment like a track, that's ok, but on a road where anything can happen, you really don't want to be right on the edge of the bikes capability and a bit of reserve is good.
Judging from your profile pic, you don't look like a 150 pound guy. Stiffer springs set up for your weight are only $140 would be a huge improvement over stock. You don't have to spend $3K for a mega monty to get improvement.
I don't think I really ride more aggressively with an improved suspension, but I do think I am safer when doing it.