Most people on this site don't in the same way they don't buy servers and prop up huge margins for AWS. The funny thing is it's not hard, I have my own personal autonomous system, IPs, and routing.

You buy transit at any "on net" site they are at, and that can include static IP routing with IPs they lease you or you use BGP to announce your own IPs (from the correct regional RIR). This is "The Internet".