|The additional public ip addresses are for other servers, you may run and provide services to the internet and are static ip addresses.|
You may run a public email server, that consumes one public ip address.
On another server you are running a web server, that should be accessable from the internet and therefore needs another public ip address.
In addition, you may run a database server, vpn server, own public DNS server a.s.o., which all must be accessable from the internet and therefore, you need public ip addresses.
But if you only need the internet line to surf the net, you only need one public ip address and this one ip address must not necessarily be a static ip address.
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