Vendors choose POA when: the property is super-prime + the vendor prefers to vet buyers before disclosing the price; price discovery on a one-of-a-kind asset is genuinely uncertain; or the vendor wants to control which competitors / publications learn about the listing.
For buyers: POA is not a tactic — most super-prime UK / UAE properties trade POA. Expect a short qualification call before the price + the full marketing pack are released. Provide proof of funds early to accelerate.
Belgrave's POA process is two-step: brief introduction call confirming the buyer's profile, then release of the full digital marketing pack including price.