Always assume you'll lose at least 50%, if buying through one of the established companies, due to the commision they'll charge on the purchase and on the sale.
You can occasionally find a bargain. We bought a plate for my wife in about 1998 for £2,000, sold it in 2006 or 2007 for £22,000.
But we didn't buy it as an investment like that - though we thought it was cheap when we bought it. We also only sold it because someone put a note on the windscreen one day, saying that they had 2 people who were looking for that plate or something very close. A bidding war ensued, which always helps to push up prices.
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