I'd argue that going the game you probably get more frustrated about not being 'entertained' than you would from watching at home!
When the game is terrible you can think of things such as the cost (around £30 per ticket for season ticket, £50 for a one off game, travel, parking, refreshments if required etc) it can add up to about £60-£100 per game......more if you are taking a youngster with you etc! There is also the time it takes out of you life schedule..................whether its booking time off work, missing out of other activities, gym, football etc or just liking to chill on the couch at home or put your kids to bed!!
You are sacrificing all that to go and watch some turgid football!!
Watching from further afield in terms of TV (not in terms of our American fans who get up at silly o'clock to watch us etc) you are more accepting of the way 'have to; play! Your not stuck in a car park at half 10 at night waiting to get past all the traffic to get home! You are at at home or in the pub or at the gym straight after! You haven't lost anything by not going! If you have gone and it hasn't gone well..........there is a feel of regret!