I thought I made a mistake once, but I was wrong.
The op reminded me of two stock stories.
1) I had a class at Franklin taught by Dr Blackwell, who was great, but I think he came with the building. He had a son who was a business/investment wiz and you paid to hear him give a lecture. He gave one to his dads class every year for free. I asked him for a stock tip and he was reluctant, but said there was a drug company called GD Searle and if they could get an artificial sweetener to dissolve and stay stable in soda pop, watch out!
The product turned out to be NutraSweet (aspartame) and I took the 5k I had in the bank and bought a piece of crap Dodge Magnum.
2) Five of us had a stock club at work that was born out of a $10 a week lottery collection. We wondered how much we could make if we put that $50 a week in the stock market? Well this was the tech boom where you could throw a dart at a tech stock and double up. We bought several companies like Dell and Sun Microsystem, but our biggest winners were Amazon and Priceline.
Then came Metricom. They had wireless internet before wifi and 3g and sold a modem called Richocet that plugged into your laptop. It gave you twice the speed of dial-up, which was 56 kbs at the time, but the company needed to place access points on telephone poles to "light up" a city. This took negotiating with local cities and suburbs and it was painfully slow and expensive to roll out of the r & d stage.
Paul Allen of Microsoft fame became a huge cash influx and our little $6 stock started rolling. We eventually sold all of the other 4 stocks we owned and dumped all 10k (by that time) into Metricom. We had an averaged share cost of $28 when it hit $100. We were giddy and greedy as it rolled out into over a dozen large markets. We ignored rumors of potential cash issues and that Vulcan Ventures (Paul Allen) was going to pull out. We were certain we were on the ground floor of the next Microsoft.
Back in those dot com days when bad news hit, stocks went into a free fall. Metricom was no exception to that rule. We didn't pull the trigger right away because there was some rumors of new money coming in and we believed in the product. Besides, we reasoned, this all started as "throw away" money. Well we threw it away when we finally sold for $11 a share.
Greed always equals regret.