I am a BT phone line and BB customer and pay £8pm for month for BT sport (on SKY Q) and in HD. I have BB infinity 2 and pay £12pm for that. I do PAY £193 per year for the phone line though. One I never use.
I also have a '4G' sim only deal with BT at £10pm giving 500 mins, 4GB data and unlimited texts. Though this was a later add on and did not affect the BT Sport package.
I do remember that my brother was a SKY customer, but not a BT customer and paid an horrific amount for BT sports: only to watch Arsenal. It really was ant worth it for the number of games on. Though now they do have exclusive rights to the Champions League.