Since the middle class pay the majority of taxes your argument that it's oligarchic is incorrect.
Again, your scheme PLAINLY is meant to give more voting power to a minority of people who have a lot of money, while disenfranchising a large number of people who are poor. That is a recipe for violent revolution, the sort of thing that the establishment of democracy put a stop to. It's dumb. It will lead to entrenched poverty where those who are poor lack the political power to change the things that keep them poor, while those who are rich are able to use their enhanced voting power to maintain barriers to entry that prevent the poor from competing with them. Really, really dumb.
Those with money are ALREADY over-represented in the political system by way of their ability to make campaign contributions (at all) and by way of their ability to publish their views widely in the media. That's already more than enough extra power.
That's the problem; the government is absolutely a corporation and if we treated it like one we wouldn't have $500 billion in debt. The laws would continue to be written by democratically elected members of parliament as they are today, so your final statement is nonsense.
The government absolutely is not like a corporation and is subject to economic conditions completely unlike a corporation. That sort of wrong-headed thinking is a disastrous way to think about government.
Consider that a business only engages in operations that are profitable to shareholders, and the only mechanism by which shareholders profit is the collection of revenue. In a government what is the return on, say, spending money to clean up some environmental contamination? The public benefit enormously from things like that, but it looks like a pure cost center to a government operating as a corporation. In other words, governments following a corporate profit seeking model would make the wrong decision--disastrously wrong--with respect to projects which provide benefit as a public good, rather than as a revenue stream.
Also your notion about debt is just wrong in two ways. First government debt is unlike corporate debt, secondly, corporations--if you actually knew anything about them--have a strong incentive to maximize their debt, as the increased leverage maximizes profit. Corporate debt levels, say at a bank, are usually limited by... government policies. Whoops.
Governments are NOTHING like corporations and shouldn't be run like corporations.