So you mean, most people absolutely do prefer no delays and a private ride, since the other ~80% of Uber riders don't do the POOL option.
The market exists for both though. It's a smart move to offer this option. It's more energy economical and fiscally responsible. There's certainly even people who have the time but not the money.
The Uber Pool service doesn't require you to actually be matched. If there doesn't happen to be another rider going in the same direction, you still get the cheaper fare and it's counted as an Uber Pool ride.
The market exists for both though. It's a smart move to offer this option. It's more energy economical and fiscally responsible. There's certainly even people who have the time but not the money.