Every time I move house and change broad band connection, BT sends me a new Business Hub. I always use my own wi-fi router sothese (I now have 3) Download Free Programs BT routers are redundant. First, am I legally entitled to sell these (eg on eBay) and, if so, is there a market for them?
How good is your WiFi coverage? If it needs improving you can use one of the hubs as an additional WAP.
Ownership and legality of selling - BT need to answer that, but you need to retain one of them in case of a fault. The support team may ask you to install the supplied hub for various tests and diagnostics.