I think people are worried their insurance won't pay out in the event of a claim if the equipment is bought from authorised stockists. For a few extra hundred quid, or my favourite past time of shopping around you can buy from approved suppliers quite reasonably. Like this afternoon, I bought a turbo mini extractor for £130 including a litre of LA tan to try & two samples. It's £240 on its own in Ellisons.
Insurance companies will try to get out of claims, it's like when life insurance companies refuse to pay out on people who died in accidents because they never disclosed an illness like pneumonia. It's not relevant to the death but they can argue your not a truthful person & legally refuse the claim.
You can fake anything these days. My husband works for a luxury car marque, years ago there was a factory in India making fake cars & telling customers they were made under licence, they weren't but they sold a fair few vehicles & made a tidy profit.