Yes it is more of a concern for commercial growers - they are at risk due to the amount of people and equipment that moves around as part of the growing, packing and export/supply chain activities.
It is possible to be transmitted via seed but as you say, buying from a reputable supplier (check with them what they do to control the risk of virus transmission) is key.
Compost is not widely used in commercial growing (usually stone fibre and cocopeat bags) but it is definitely possible that it could be a source - again the compost producer should have some form of virus-control protocol as part of their production methods.
For pollinators, there is a study that shows bumblebees can spread this (and other) viruses; however what we see in the field is that the virus spreads down rows rather that randomly. this suggests the staff touching the plants is the major virus vector rather than the bees.