I can understand your point if it was high risk with high payout, but starting your own business often ends up being high risk, break your ass to eke out moderate payout. If you look at the dollars in vs. dollars out in isolation, it might look good, but when you attach a dollar amount in the effort needed to run the business, you're going to tread water for a long time before you see your first real profit.
Besides, $10k is about enough to start a lemonade stand these days, and that's if mom and dad are buying the lemons.
I agree with most of this, but expectations are a big consideration. When you start a business, you don't do it intending to make $1500, which would be a huge return on $10k in a year of stock market investing. $10k is plenty to get going with a business, though. This is the information age, after all. Selling unlocked iPhones on ebay is just one example. What most people consider a "moderate payout" on the business they started is many, many times more than what they could ever hope to achieve in the financial markets.
There's a good
article by Paul Graham about the idea of effort and wealth. In his words, "There is a conservation law at work here: if you want to make a million dollars, you have to endure a million dollars' worth of pain ... You do tend to get a certain bulk discount if you buy the economy-size pain, but you can't evade the fundamental conservation law. If starting a startup were easy, everyone would do it."
But you don't need to have the intention of becoming a millionaire on $10k, even though it IS possible with an insane amount of time and effort (and a good dose of luck). My point was just that direct participation in capitalism can often pay better than lending your capital to others, particularly if you don't know where to lend (which stocks to buy). If you don't know stocks from socks, but you know a lot about collectible cars and the parts and work they need, then with some hard thinking there's probably a way to make some decent money with that $10k...
A terrific return on the $10k in a year in the stock market would be about $1500. Someone with good connections in collectible parts (or someone willing to get them) or who knows how to unlock iPhones could easily do much more than that without destroying their quality of life. One good parts deal could double that, it seems to me. One batch of iPhones sold on ebay should net at least 30% ROI -- way more than one should expect in the stock market, and you could do it multiple times in a single year.
Jim