You like paying for cable.

If you cant handle even minor buffering its best you avoid

1. It's illegal
2. You don't understand the technology or setup
3. You don't own devices capable of running it.
4. You have extremely slow internet.

Your wife will not tolerate buffering during The Bachelor season finale.

1. you don't watch live tv very much

2. you don't feel like giving your payment details to sketchy black/grey market operators.

3. it's illegal in your jurisdiction

4. other forms of obtaining media (ie legit services like Netflix, or piracy) work better for you

You like YoutubeTV/Philo/Hulu. I like Philo. I have a Roku and there wasn't a nice IPTV player for it and I really didn't want to buy another streaming box.

You are wealthy and don't mind lining the pockets of the scumbag cable companies.

Because C-lines are 100% better and more stable.

You have groups of friends over to watch live events who won't understand if it isn't working.