Because most people's problems are they don't have the router's power cord plug in followed by the coax / ether / fiber cord.

The amount of times the software doesn't work because the HASP key [1] is plugged into a different machine is so many.

You just can't trust that they've done any basic troubleshooting and so have to start from a completely blank slate.

[1]: https://en.wikipedia.org/wiki/Software_protection_dongle