ISPs are just retailers. In fact, they are now called Retail Service Providers!
Indeed, but I guess they are retailers not resellers. They have some input into how you use the service and if you don't like it go somewhere else.
I am with Exetel, a 50/20 plan that so far I am very happy with. Stability and speed have been excellent. I cut over from my previous ISP after they screwed me on a downtime refund claim. Was with them for 15 years, so much for customer loyalty counting for anything.
Since I read the fine print and found that unless you request otherwise you sign up for Carrier NAT, I found that some ISP's do this and some do not. I can understand the driver as it saves on IP addresses and certainly not everyone is going to need a static IP.
Having said that they were very good and very fast in cutting me over to a static address once I stated my case.