I'll explain this SEC filing in layman's terms: US
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This is the benefit of being rich. You can make a greater return when you have more money. Keep in mind, there are high standards for being an accredited investor (personal net worth at least $1M, with income of at least $200K per year for the past two years, with the expectation of making at least that much in the current year). This is to protect those who don't have a lot of money because even though preferred stock looks like a safe investment, there is always the chance that the company goes out of business. Financial regulatory laws take into consideration the fact that those with less money who typically aren't as financially literate as a wealthy individual will take more risk when investing their money, and in the rare event that the company goes out of business, the small investor will feel the pain a lot more than the large investor (think '08/'09 mortgage crisis - big banks bailed out while the middle class got screwed). In other words, liquidity is absent for the 12 months following the purchase of USGL's preferred stock. So if you spent $500K on preferred shares, your money is stuck for 12 months before you have the opportunity to liquidate it. Hopefully, it's obvious why the government needs to be involved in this behavior: if left to the market system, investment banks, lenders, and publicly traded companies would get every cent they could out of anybody, and in the long run that would screw over the middle class and increase wealth among the wealthy.
And a quick word of advice to those of you who will someday be rich: always choose preferred stock if you have the option. It's almost a guaranteed return on investment (unless the company goes out of business).
Ahh, the beauty of Capitalism.