The thought occurs to everyone who has added up proxy costs: a server is cheaper than ten addresses, and putting SOCKS5 on it takes half an hour.
What you get
A datacentre IPv4. Clean — nobody used it before you, and that is the one genuine advantage. Cheap per address if you need several. Fully yours: no third-party logs, no promises to trust.
What you do not get
A residential or mobile address. A datacentre stays a datacentre and its ownership is public — see subnet reputation. For some jobs that is fine; for live accounts it usually is not.
And geographic spread: every country needs its own server, and the saving evaporates fast.
When rolling your own is right
When you need one or two permanent addresses for your own accounts, the country does not matter much, and you are renting a server anyway. Then the proxy is a side benefit rather than a budget line.
When it is not
When you need ten addresses or more, when country matters, and when the job calls for residential or mobile. Here the bought option wins not on price but on existing at all — see proxy types.
The hidden cost
Time. The server needs setting up, updating, fixing, and watching so it does not drift onto blocklists because of datacentre neighbours. Price your own hour and compare against that, not against bare rental — method in what a fleet costs.
Buy proxiespromo code NEURO — 5% off