I cannot compare to Nords excellent post but I can add my 40 pesos. Accredited means that you are not protected by the usual measures like the SEC looking after your interests?
I have been an angel investor many times. Mostly I have found that a $25k investment lead to a write off which is small compensation. I have 2 stories worthy of telling. The first is Burrard Technologies had three salt-of-the-earth founders. I joined as a Board member and discovered that they had a kiosk that would allow theater goers to buy drink tickets at intermission of a play, increasing the take at the bar by 100%. Great right?
So I gave them $35k and got agreement that the CEO would spend the money during 3 months in LA proving the concept. Although the concept was good, there were no qualified buyers owing to structural problems in the industry. When the CEO returned, we had a "come to Jesus" meeting and decided to abandon ship. He went on the return to his consulting career and has subsequently retired. We remain close friends.
Another was a startup named Jones Soda. I met with Jones and believed his story. Bought a bunch of shares at $0.55 and held on as he did the IPO. Got out at $30. This win financed all the many other losses and left us well to the good side.
I could go on but Nords has covered the territory enough. My guess is that this is not what most members here would want?
I have many other stories both good and bad but I think like Nords, you have to be in it for the long haul to make any money. And most importantly, you have to be prepared to lose 9 for every one you win! Not for the feint of heart! We count on the winners being 10x the losers. That just gets you to even!