I receive an email each week from Simply Wall Street a mob that...

I receive an email each week from Simply Wall Street a mob that analyses stock prices. Last week when CBA was $144 they say it was 20% over valued, That gives a fair value of $115.

I'm a bit on both sides here whether to take the profit or not. I had a stock that went through the roof a couple of times. If I had sold I would have had to pay $300,000 tax. I keep them and lost most of the money. On the other hand my sister has been a buy and hold person. Over 40 years she has gone from nothing to being worth $15-18,000,000. So each to there own way of doing things.