I got burned when I sold my first collection to buy my first computer ( a Sinclair, it was that long ago!) I had ammassed a great collection of early Victorian & Edward VII silver from Malta, mostly EF, where it was in circulation at the time. I also had a number of Saxon and Norman pennies that I'd give my eye teeth for now. The money only just covered the cost of the computer, which, although well used in learning programming, never lived up to the quality of the collection lost.