Who says people aren’t taking that into account? (your last sentence). Dress it up how you like, but, as much as it pains to say it, we just don’t have fans of the calibre of those at Fratton; no way would the Amex be anything but pretty much empty by the 80th minute, let alone after 5 minutes...
And sadly had that been us down 0-4 at the Amex against Palace the home stands would be very sparsely populated. An impressive show by the Pompey fans, relatively few empty spaces at full time.