I would hazard that most speed plans over the usual residential ones up to the 100/40, eg the 1000/400 are more likely the result of sales to businesses that require the extreme throughput or are other resellers who are purchasing it to for example sell to a new development they are maintaining. The ACCC spreadsheet write up also notes it does not break this into distinctly residential and Wholesale "the extracts do not separately identify access services that are used by access seekers to supply retail or wholesale services". I am not surprised that it would be a small subset of total connections or that it has grown a bit. There might also be some wealthy residential buyers but I would think they would be a very tiny portion of that already small number.
I think the growth to higher speed tiers in general is because consumers are now becoming a bit more aware of what is doable. Telstra and others early on either sold 25/5 packages or 100/40 ones. They then got tackled over the 100/40 non achievers and went back to a more conservative selling approach of offering 25/5 with the promise to apply speed boosts if a line was able to support it. So we have a more aware public many of whom started out on a 12/1 or a 25/5 and then got "hungry" for more. These got a boost to 50/20 or they went to the 100/40. Then we have the non achievers who either dropped to a 50/20 package or went to a 25/5 and then retried at the 50/20.
This is reflected in ACCC's reporting on improvement particularly in the 50/20 group:
"Report found the number of 50Mbps services being acquired from NBN Co increased from 158,959 to 989,360
Retailers have taken up these incentives in large numbers, enabling their customers to transfer to the higher 50Mbps speed tier, which offers them a better NBN experience.
“We are pleased to see retailers taking up the higher speed services and enabling their customers to shift to 50Mbps plans. This is good for consumers who can enjoy the benefits of higher speeds,” Mr Sims said."
It is good to see CVC climbing, albeit slowly, with only really a 0.03 Mbps change in 3 months. It might earn high praise from the ACCC but with the "special discount deal done" you would like to think this would have grown more substantially than it has. I think it still shows 1) a still relatively high CVC cost even with discounting & 2) the reluctance of RSPs to spend any more than the absolute minimum they have to (so as to keep the customer complaints from creating too many ACCC waves). In the 2nd point I think the RSPs try to keep a balance of the complaints Vs costs that might be described as an art form in it's rendition.
I don't think this is as much of an issue as it was in the beginning. Once the ACCC fined and started making TPG, Telstra and Optus reimburse customers and void contracts for the failed 100/40 plans, I think many decided it was more prudent to offer the softer 25/5 option and then check sync rates and offer boosts based on that.
Though you do raise an interesting point about the measurement of sync and that is about the Choice NBN monitoring program. Perhaps that is something that participants could check and report on, it would be good if the test unit could interrogate the modem/router for it and send it as part of it's data packet but I am not sure how smart it is in that regard. But regardless a user would only need to probably report it once unless some large change occurred to the supply eg when ADSL is cut off in an area. Something for Choice perhaps to ask Louise Hudson about?