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You will never know what will be in 10 years - maybe the Speedy bubble will have burst and prices will have come back to a reasonable level...
only time will tell
To add on... not sure that's a great return, you're essentially looking at a 8.5% CAGR - assuming that you bought in at 40 (debatable) and can sell at 90 (seems reasonable, but who knows) in 10 years. Putting it into the stock market might be a better bet.
That said, you can't really wear any shares of Google or Amazon or whatever you bought, so...