Proxy pricing looks arbitrary until you split it into parts. There are four, and only two of them decide whether accounts live.
Address type
The main component. Datacentre IPv4 is cheap: hosting companies hold plenty. Residential costs several times more — the provider issued that address to a real subscriber, and somebody pays for every one that ends up resold. Mobile costs more again.
Privacy
A shared address is split between buyers. A private one is reserved for you. The price gap is roughly double; the risk gap is total, because on a shared address you answer for neighbours you have never met.
Rental term
A month is cheaper per day than a week, and this is the one discount worth taking without thinking: a proxy for a working account is needed permanently. Swapping addresses every seven days is rotation done by hand.
Country
Expensive destinations are the ones with few resellers and plenty of demand. Buy not the cheapest but the one that matches your numbers — see proxy geo and numbers.
Where not to save
On privacy and on type. What you save there you pay back in accounts, and an aged account costs more than a year of address rental. The full method is in what a fleet costs, and turning risk into money is in pricing the risk of a ban.
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Where you can save: on term, on country if it matches your numbers, and on volume — a batch of ten usually prices lower per address.