As long as the network is legitimate, it can be a good way to pick up some extra money on a steady basis. You won’t make a fortune, since your rewards will be limited to how much money you will spend. You certainly don’t want to get carried away, spending money just to generate rewards. That could put you into a situation where you will spend more money than you will earn from the network.
You can invest in a total stock market or S&P 500 index fund in most employee retirement plans like a 401(k), 403(b), or 457(b), as well as individual retirement accounts like a Roth IRA, Traditional IRA, SEP IRA, and Solo 401(k). While I personally invest in a few individual stocks, I largely recommend that you avoid investing in individual stocks unless it’s with less than 10% of your total net worth.

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I feel like if I am not happy/content with a million dollars … I am probably not going to be happy with 2 or 4 million either. My goal is to generate as sum passive as my expenses (inflation adjusted). There is always the fear of unknown. That being said I would not some more money. My plan is to establish a foundation which provides educational scholarship. There is a reason for my frugality :-)
This is probably the most exclusive level of financial freedom. Hopefully, your financial freedom plan will allow you to outlive your money. Having more money than you expected to spend is great. Building enough wealth so that you could not possibly spend all of it is another. This group will likely be filled with people who either won the lottery, inherited a fortune or are founders of companies – think Bill Gates or Warren Buffet. Even if they went on a spending spree buying planes, yachts and automobiles; they would still have a hard time spending all of it. I should note that both Gates and Buffet have pledged to give away a vast majority of their wealth when they pass. I would be unfair to count that as “spending all their money.”