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Collector plates were a hot market several decades ago when many consumers purchased them as investments as well as decorative objects. However, instead of increasing in value, most plates turned out to be worth much less than their original price.
In California, the revenue from vanity plates is dedicated to environmental projects, so such plates are called environmental license plates (ELPs). Other special plates are made to survivors of the attack on Pearl Harbor and recipients of. national honors like the Purple Heart and the Congressional Medal of Honor.