I don't think those charts support your numbers (they show a median of $3m raised on $6m pre... $9m post-money, 33% sold). The idea that founders collectively own 30% of the company after a Series A is pretty wrong in my experience (I've raised a Series A and have lots of friends who have as well-- inside and outside of the "YC Mafia").
If I ever had a friend tell me they had a term sheet for $3m on a $3m pre-money valuation, I'd tell them they were either lacking leverage or that someone was trying to take advantage of them.
I'll see if I can dig up some better #s. But a few comments...
--to get that leverage you usually have to meet some milestones (get some traction), and that is usually done from a seed round where you already gave up some dilution. I think it can be increasingly done via YC (6%) or even by one-self, but there are still certainly a lot of seed -> series A
--the eventual dilution # also includes the option pool (another 20%). Like I said in the post, not all of this may be allocated at the time of acquisition, but it may be and it does sit out there on the cap table.
--I assume you and your friends have raised from relatively well-known top tier VCs. There are tons of VC firms we've never heard of, so when you look across everything I think the #s may look different. WSGR is of course seeing top-tier deals.
--This is mainly for first time entrepreneurs, who for many reasons are often in a position of less leverage. Of course, as I said traction trumps everything, so I think you should go for that first. It's the quickest path to exit and the least dilution.
If I ever had a friend tell me they had a term sheet for $3m on a $3m pre-money valuation, I'd tell them they were either lacking leverage or that someone was trying to take advantage of them.