[zamadatix]

ATT home fiber is typically 32 ONT sharing 1 OLT, doesn't come with the SLA, and doesn't let you assign your own IP space to the connection (along with some other knobs BGP lets you turn).

Of all of that the bulk of the price increase is them running the dedicated fiber so you can go from 32:1 to 1:1. It costs a lot to not have the same physical setup as the rest of your neighbors.