I'm not sure if residency (or even citizenship) is naturally or artificially scarce; I don't think rich retirees, or smart entrepreneurs, lower the quality of life for existing citizens, but an argument could possibly be made that lower skill employees might increase supply and thus depress wages for certain categories of labor (especially positions with an inelastic demand).
I would certainly prefer 100k immigration slots going to 100k predominantly indian and chinese engineers than 10k indian engineers, 10k chinese engineers, and 80k family members of existing immigrants from around the world of varying education, skill, and wealth.
Even for immigration, money talks.
E-2 non-immigrant visa, for treaty investor visa, renewed every year.
EB-5 permanent resident visa, for investors who invest 1 million and create 10 jobs or invest 500k and create 5 jobs in economical hardship area (I guess such as Detroit?)
No special visa for penniless entrepreneurs though.
Can you really? How does that work?
This system is easy to understand, transparent, and offers certainty that the patchwork quilt of immigration statuses does not. You'd hear a lot less whinging from the nativist set if they were automatically $50k less expensive than the next guy. This would essentially eliminate any abuse of (legal) foreign labor, as employers would no longer hold any particular power over the fates of their employees, other than the usual ones accorded by contract law. (I can see Microsoft or whomever offering to foot the bill if they were guaranteed 3 years of service, and have absolutely no problem with that arrangement.)
It would also be easier for desirable foreign laborers to interface with. Believe me, I can tell you from personal experience, NOTHING scares me like a routine visit to get my visa renewed. It is the only time when I am ever totally at the mercy of a clerk who has a Destroy My Life button on his computer. Folks trying to fit an extended stay in the US into their near-term life plans must have similar emotions. This would quiet them. Pay the license fee. Get the green card. Simple, easy, fullproof.
Besides, you can essentially buy your way around immigration laws anyhow, so we might as well be honest about it.