If I attend a home game with my son, it will cost £32 to get in, plus travel costs, plus refreshments at the game, programme etc. If we watch from home I would pay £15 for the stream, without even thinking about it.
So, that would be £7.50 each and as we would sit and have a few beers each, the cost of the beer would still be more than the cost of the game.
Most people will watch with friends and family. If it was pitched at £10 and four people were watching at the same venue, that would be £2.50 each, with no additional travel costs, which I think is too low.