When considering who would have an interest in an EX model, it may become clear why no one bid against you
The EX 87V is a specialist product serving the explosive atmosphere market where lives are at risk. The standard 87V meets the needs of everyday users and may be sourced cheaper than an EX model. A person who's life is on the line when using an EX model is unlikely to wish to take the risk that the unit no longer meets the EX specification or has been tampered with. Its too late when there is a loud bang !
It's a bit like buying a used defibrillator... you can't test it on yourself as that's crazy dangerous....so will it work when it is actually needed or is it faulty/damaged ? Those who work in high risk environments need to have total trust in the equipment they are using..... second hand kit with unknown provenance would be considered foolish to such people.... I have worked in such environments so know first hand. Life insurance also becomes an issue....if you use dodgy kit and die, the insurer may not pay out for your family.
Retesting an unknown provenance used EX meter can also be very expensive, with the risk of test fail resulting in scrapping of the kit.
You have a very nice meter that will never suffer from moisture ingress
Enjoy it....but don't expect to sell it on to someone working in explosive atmospheres