I'm not sure if that's going by the spirit of the rules personally. The rules do say that you lose everything not spent, receiving a small bonus to the die roll determining starting money. Buying a few cred sticks is one thing, but putting some of those char gen resources on them just sounds like rules mangling to me.
Yeah, if a character wants that build cash, they need to take a custom-high lifestyle and buy starting cash at 5:1 like everyone else. 
Psh, just a high lifestyle? Here's how you live the good life.
Qualities: Born rich, debt.
330,000 nuyen
Max-out luxury lifestyle, minus the neighborhood (you'll see) = 25 LP.
Rad Pad +1 lp
Corporate owned -3lp
no astral privacy -3lp
No Neighbors +1 (this lets you bypass the need to pay for a neighborhood, since there isn't any)
Trigger-Happy Landlord -1lp
You can explain those qualities away by saying the place is owned by the Saeder Krupp Prime Intelligence agency near Lowyr's Estate in Tir Tanginre, and they let you pimp the place out.
Buy a year of that. You're left with 210,000 (120,000 for a year). According to the rules, your lp gets you a free car. Make it a Eurocar Westwind 3k. Then buy a hydrofoil boat, and a susuzki mirage. I know, I know, the temptation is to spend a little less on rent, and blow the rest you got on a yacht, but you'll have to save up for that. It's just not feasible to start out with one. Believe me, I've tried.
For bioware, buy the Pheromones (rating 3). You should be a Dryad, have the exceptional attribute on charisma, and have your con (seduction) maxed-out, so you can basically get any bitty on the planet.
Buy lasers and a enough ammo to last you ten runs. Spend the rest of your money on a custom commlink, clothes, nightclub passes to the hottest clubs and resort hotels in the world, and bling. Leave 300 resource nuyen left, so you get the die bonus. See if you can catch your dm being lazy, and give yourself 24,000 starting cash. If your DM is indeed lazy, he'll see it as plausible, and leave you alone. If he isn't, well, you still got 7d6 x 1000 starting cash, so it's whatevs.
Make sure you leave a decent amount of bp left for contacts, because you need to know the owner of a luxury hotel (so you can get a totally comped stay in Vegas or something), be on a first-name basis with Dante (yes, the club owner), Orxanne, a ton of other celebrities, and anybody on the Grand Tour. Finally, you need to have a loyalty 6, connections 6 relationship with Damien Knight, so you can ball around the world in style and power.
With contacts like those, making money and living large shouldn't be no thang. If you really get desperate, you can always gamble all your money on the super bowl, and sell the Westwind. That should buy you at least a month or two. If you're still in the red, just make sure you have a 6 in hacking and spoofing, so you can spoof the lifestyle you got.
That, my friend, is how you live in the Sixth World.
