It's good for recruitment and retention
"Showing that the company is pro-U.S.A. and a great place to work is good for turnover and helps with recruitment," said Heidi Golledge, CEO and co-founder of CareerBliss.com. In fields where competition for talent is fierce, something like Facebook photos on the company page of workers cheering on the team sends a positive message to prospective employees.
It's going to happen anyway, and IT willsuffer
Banning employees from watching the game won't stop them. It's just going to make them sneakier — and lots of surreptitious streaming could slow the company's Internet access to a crawl, said Jack Cullen, president of Modis IT Staffing. "People wanting to do work will have a more difficult time because the network is slower," he said.
Read More167 people cashed in on bet that Luis Suarez would bite
People will feign illness
A ban on the game will prompt some workers to just call in sick, Challenger predicted, and unscheduled absences can wreak more havoc on productivity than having people just leaving their desks periodically. At best, it will mean extra-long lunches on the East Coast and in the Midwest, and late arrivals in the West.
It's uniquely unifying
The World Cup is different from March Madness or the Super Bowl because those events can foster an us-versus-them mentality. "We really, as a country, don't come together all that often to unify around something," Honaman said. "We're always so divisive. This is kind of unifying," she said. "I think a lot of it is about patriotism, even if you're not a soccer fan."
And ... you have permission from the coach
U.S. head coach Jurgen Klinsmann tweeted a permission slip, saying "I understand that this absence may reduce productivity of your workplace, but I can assure that it is for an important cause."
—By Martha C. White, NBC News