Just to add, you can also (at least UK based members) get 'cashback' by way of VS flying club points. Go through the shops away shopping portal on the Virgin Atlantic website. Typically you 5-6 points/£ for non-USA hotels. (US hotels seem to be less).

This 'offer' has been constantly present on the UK shopping portal for years so is an alternative when the CB sites are not offering any CB. There is a USA shops away portal as well but I haven't visited that. You can also get 2 points/ £ for Hyatt hotels.