nalim,
First, welcome to the forum. Lots of good information is available here. And the forum members are gentlemen.
To answer your question, you're shooting schedule is a bit heavy.
My R9s was built and shipped in July, 2005. I have put a total of 1400 rounds thru it with one trip back to Rohrbaugh at 1,000 rounds. (Cracked slide - replaced & returned in less than two weeks.)
Karl Rohrbaugh characterizes the R9 as a "Carry a lot - shoot a little" firearm. He recommended I shoot mine less - simply because it's an early serial # with carbon fiber grips. Don't get me wrong, Rohrbaugh stands behind their guns 100%, but the R9 isn't meant to be a 'range warrior'.
I have several .40 S&W pistols that are made for heavy service, so they are the guns that get lots of rounds thru them. The R9S gets two mags per range session. If you don't have another pistol to shoot a lot - there's your rationale for buying one!
Hey, I think I just talked myself into buying that Ruger SR9.
Steve