OK, I'll bite. Yes, I have a +$300k annual income, so I'll give you some insights. But first, how in the world are you spending $8 - 9k per month as a 30 year old with no kids? Are you in NYC renting a 2,500 sq./ft condo with two garage spaces? Does that include $3k in student loan payments? That is an eye-popping figure to me.
After taxes, I net about $13k per month. I get another $50K in company stock, so that goes straight into savings. My end-of-year cash bonus goes straight to savings as well.
Where and how I live is really the difference maker for what I will tell you. For me, I live in a really nice house that is worth about $650K. It is in one of the best public school districts in the state, so no private tuition. Real estate taxes kill me at $15k per year. Add insurance and utilities, and the occasional roofing or plumbing issue and the house costs me about $2k per month (without a mortgage payment). I drive really modest cars and keep them for about a decade (pay cash). Not much here. I take modest vacations (not quite Clark Griswold, but close). The stupid stuff adds up - baseball camp for kids, swim team, summer camps, clothes my wife thinks are "cute" for the kids (she does not work outside the home) - this will come later, but don't underestimate it. Add in $5 - 10k for charities.
Add all those things up and I can sock away +110k per year (including my stock). I think this is pretty good for my income. At this point, you can put aside the $15k per year in the 401K at work (or whatever the max allowable). You can set aside the $250k per kid in case they go to private colleges. You can easily fund retirement beyond the 401k and pay-off the house. Then, when you hit 50, you get restless. Do I quit early and take on a more meaningful career (non-profit management, teaching, etc.). Do I buy a ski house? Do I buy a hobby farm?
So, before you get to those existential questions, what do you do? If I was that fortunate at 30, I would:
1. Buy a reasonable house you can live in for 10 years (think about the school district for resale value, commute, etc.)
2. Pay off you student loans in an accelerated timeline.
3. Max-out the 401k, IRA or whatever tax-advantaged options you have available.
4. Learn investing for yourself (read the WSJ, Money, etc.) rather than relying on people selling you things.
Good luck and don't go wild, you never know what you'll want to do at 45. Having the savings makes more things possible.