Great post Jim. While it is convenient to lump the entire dividend income as one passive stream, in reality, it is several. If you have 30 companies across 10 major industry sectors, each paying you dividends, then you can consider having 30 streams or at least 10 passive streams, from each of the diverse industry sectors. I find this more diverse than relying on rental income from one investment property tied to one location and one good tenant. Your point about website is absolutely valid – will be great to have Ten Factorial Rocks worth 7 figures in less than 5 years as you have done!
Both the prosecution and the defense in a malpractice trial need expert witnesses.  These guys often make several times more per hour testifying than they do practicing medicine.  Even just reviewing potential cases may earn you income.  Don’t forget your ethical standards when engaging in this type of work.  I suggest you stick to your own specialty and do defense work only.  We’ve got enough docs out there already willing to sell out their colleagues for a few bucks.
And, there’s no way to build up a base of subscribers like that unless you’ve been doing this for years and years. The unfortunate truth is that they profit off of your naivety. If you don’t want to have your hopes shattered, realize that you’re in this for the long haul. If you want an eventual life of leisure, able to roam the planet as a digital nomad and make absurd amounts of money online, you have to put in the sweat equity.
What I find most interesting is the fact that I had never considered options like LendingTree or realityshares for other income sources. Investing in property has been too much of bad luck for people that I know personally, so I am interesting in getting involved in a situation where I would have to be dealing with maintenance issues or tenants. There are services for you to do that, but I had not come across any that didn’t eat most if not all of the earnings. Then again, I live in the NY area. Investing in the midwest would not be reasonably possible for me, directly, but reading about realityshares is something I am going to look into further. That might be a real possibility.
Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.