It massively reduces the number of script kiddie attacks. It's not hard to find SSH on a non-standard port but most SKs don't know or don't bother. Other possi

It massively reduces the number of script kiddie attacks. It's not hard to find SSH on a non-standard port but most SKs don't know or don't bother. Other possible reason is NAT. If you've got several machines or VMs but only one public IP you can port forward different public ports to port 22 on different machines. Not the only solution by a long way but a relatively straightforward one.