mentalinc:
What are you trying to achieve?
Do you make money from the fibre improving productivity?
Have you ruled out alternatives? e.g. starlink or getting another VDSL line etc?
What are you VDSL sync stats and speed tests? Have you done everything you can to make this the best it can be?
I do a lot of telecommuting, and I host services. I do a lot of large file shares as part of a video production outfit, and VDSL is just really not great for that kind of bandwidth hog.
I gave Starlink a go for a month. We could not get a reliable video call out of it (every 10-30 minutes would see a few seconds of disconnect, and that's just incredibly disruptive), and streaming services would have buffering issues. It was much faster at downloading though and had a lot higher bandwidth.
I typically see speeds around 60/25. Sundays it can get really bad, I assume everyone is just streaming video or something. We get by on VDSL... but fibre would just be a straight upgrade for us, worth thousands of dollars (but not 10s of thousands).