Hi galumayJust comments in general - RSP's like VOC & TPG will be under intense pressure with dropping margins with the NBN, the cost of supplying the service are much greater than the amount consumers will bear, so two things happen, firstly the RSP's grossly oversell the service, which causes congestion and consumer fury at not getting what they are paying for and of course margins drop.
To give you an idea of the scale of the problem, the CSV charges for a 100mbps connection are over $1500 per month - so if my RSP were to provide a continuous 100mbps service to me - which is what I am paying for - they would make a massive loss! (there are other smaller costs as well.)
So RSP's run very low contention ratios, hoping like hell that not all the customers are trying to use all of the speed and date at the same time of day.
The double wammy is that at the same time users habits are changing with lots of users signing up to streaming services like Netflix which means the load on the infrastructure is quite different to when people just browsed the web and checked their email.
Its not a sector I have any interest in being invested in.
I think we've got a fairly similar understanding but we're coming at it from different angles.
The higher costs actually favour the big players because of their much larger customer bases. My understanding is that because the Gov decided to make 121 Points of Interconnectivity (POIs) instead of 14 it means an ISP would need a much greater amount of connections to the network to service a client base across all areas. As you alluded to the costs of access to each POI are very prohibitive because the data blocks are sold in large amounts (NBN Co itself does not seem to split them into small chunks). An ISP with a small amount of customers will simply not be profitable at some POIs because of this. What will happen is the big players will buy the data blocks and on-sell any excess to the smaller players (which is how "reselling" works now, it's just that there is only one wholesaler (NBN Co) and larger "middle men").
By default the cost bases of the bigger players who can buy data blocks direct from NBN Co must be cheaper than a smaller player who has to buy them from said bigger players.
Now re access: I actually think you've got it around the wrong way. The bigger players will split the speed up however they see fit, and at the end of the day the retail customer basically has no choice. The bigger players will get the margins they want, and if you want faster speeds you'll pay through the teeth for them. The only way margins come down is through competition IMO.
The bigger players all conveniently have their own high speed networks. For instance Amcom sits in Vocus. Why does this matter? Because businesses who actually need higher speeds and reliable connections will pay for it. And they're more likely (just IMO) to go for a private player over NBN. Arguably there's probably also privacy/security benefits too.
Then there's the overseas data cables... TPG and Vocus seem very interesting in expanding these. Again outside the NBN network, but necessary by default for Australia to access anything outside of its borders. They're cash cows once you've got the scale too.
That's how I think it will play out.