To keep his family of four entertained, Ben Emery pays about $180 a month for Spectrum TV and internet service, Netflix, Amazon Prime and Hulu. He gets Amazon mostly for free shipping and Hulu in part because his 5-year-old daughter likes Teen Titans Go.

"Netflix and Hulu got in early, so that's where I'm willing to invest my money," said Emery, 41, a bank risk officer who lives in Kernersville, N.C. "I don't have unlimited funds."

Consumers such as Emery represent an inconvenient truth for the burgeoning online video industry. Just 16 percent of U.S. broadband homes subscribe to three or more video services, according to researcher Parks Associates. And nearly two-thirds of TV homes already get at least one of the big three: Netflix, Amazon Prime, or Hulu, according to Nielsen.

That's the dilemma for the growing ranks of providers, now pegged by Parks Associates at about 200 in the U.S. alone. Earlier this month, AT&T Inc. said it will introduce a service with HBO and other fare from its recent Time Warner Inc. purchase, while Hollywood mogul Jeffrey Katzenberg disclosed details of his upcoming offer for high-end, short-form video. They'll debut late next year — about when Walt Disney Co.'s new online channel is launched.

"You definitely could argue there are too many," said Laura Martin, an analyst at Needham & Co.

Media executives say they're confident that the digital frontier is big enough for more paid video services. They're gambling that a rising number of cable TV cord-cutters will enlarge the pool of customers. But they also recognize that there are limits to consumer spending.

John Stankey, head of AT&T Inc.'s WarnerMedia, said recently that he thought the market could sustain  two to 10 online video services. The phone giant put him in charge of Warner Bros., HBO, and Turner Broadcasting after completing its $85 billion takeover of Time Warner Inc.

"What I do know is that we'd better be at that table," he said at Vanity Fair's New Establishment Summit in Beverly Hills.

Netflix and Amazon already have a substantial lead, with more than 130 million and 100 million subscribers worldwide, respectively. Netflix already claims almost half of U.S. households as customers. Only a small number of other paid streaming services, such as HBO Now, have gained more than five  million subscribers.

As more online services enter the fray, some are seeing growth slow. Dish Network Corp.'s Sling TV — the most popular of the cable-TV replacements called "skinny bundles" — added just 41,000 subscribers last quarter, down from about 120,000 a year ago.

Although Netflix added more subscribers than expected last quarter, most of its growth is coming from overseas. Some paid channels, such as the Warner Bros. service for Korean dramas, DramaFever, and NBC's comedy-focused Seeso, have shut down.

"Someday, there will have to be competition for wallet share," Netflix chief executive officer Reed Hastings said Tuesday on an earnings call. "We're not naive about that. But it seems very far off from everything we've seen."

The U.S. market, however, "may be near saturation" in terms of new homes that are willing to pay for streaming, according to Tony Maroulis, research manager at Ampere Analysis. That means growth will hinge on consumers willing to pay for multiple services, he said.

Companies such as Google's YouTube, Amazon, or AT&T may be more willing to lower prices and accept financial losses if video helps grow their other businesses, like online advertising, e-commerce, or wireless, said Gregory Williams, an analyst at Cowen & Co.

Others may need to spend lavishly on content to pull subscribers from Netflix, which has an annual programming budget of about $8 billion. Disney, for example, is laying out $71 billion for most of the entertainment assets of 21st Century Fox Inc. as part of a strategy to develop its own online services and pull content from Netflix.

Disney's lineup of Star Wars and Marvel properties could lure fans from Netflix after deals to provide the streaming company with those movies expires. AT&T could choose not to relicense reruns of Friends to Netflix when their deal lapses. The Warner Bros. sitcom remains popular in syndication.

"If it's a zero-sum game, Netflix has the most to lose," Martin said, because it has the most subscribers. "And if the pie grows, they have the least to gain."