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One startup is learning the hard way that it takes much more than rapid growth and a dedicated user base to build a sustainable company.。

Fitness class startup ClassPass rocked its subscribers Wednesday with news that the business is axing its unlimited tier, which allowed people to attend as many fitness classes as they wanted for $190/month.。

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SEE ALSO:Salary or equity? This website wants to help you understand startup job offers。

Instead, the startup is now moving users over to a new plan called "Core" that offers 10 classes a month for $115. Naturally, ClassPass subscribers are mad as hell about the change. The company's Twitter feed has been flooded with users threatening to leave and complaining about the change.。

Tweet may have been deleted。

Tweet may have been deleted。

Tweet may have been deleted。

Tweet may have been deleted。

Making matters worse is that this is the third time since 2015 the company has messed with its subscriptions. Initially, unlimited plans cost $99 a month. Last summer, the company raised its prices to $125 a month and then to nearly $200 a month earlier this year.。

Tweet may have been deleted。But while many ClassPass devotees were shocked by yet another price hike, the news shouldn't have been much of a surprise at all. Offering an unlimited number of classes, which could cost upwards of $30 each, at a flat rate is completely unsustainable.。Mashable Light SpeedWant more out-of-this world tech, space and science stories?

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ClassPass CEO Payal Kadakia admitted as much Wednesday, writing in a surprisingly frank letter to customers that there was a "fundamental problem," with the company's business model. Kadakia noted that the unlimited option was originally intended as a limited time promotion, but its popularity caused them to rethink the original idea — even if the financials of it didn't add up.。

I focused on nurturing that spark assuming we’d figure out the business model as the company continued to scale.。

"The promotion was a spark – it didn’t just help launch ClassPass, it helped ignite something truly special in our community," she wrote. "I was so taken aback by the promotion’s success I focused on nurturing that spark assuming we’d figure out the business model as the company continued to scale."。

"The truth is there is a fundamental problem with the Unlimited plan. It can’t be a long-term membership option because it doesn’t align our business with our promise. What kind of business would we be if we wanted our members to work out less to reduce costs?" she wrote. 。

While ClassPass is hoping it can persuade users to make the transition — it's allowing users to keep unlimited plans for an extra month and offering up additional "add-on" classes for those who want more than 10 a month — its struggles highlight just how difficult subscription-based business models can be, even for a relatively well-funded startup like ClassPass.。While so-called "unicorn" startups like Slack and Uber are able to operate at a loss in order to keep prices down, even those companies couldn't maintain an "unlimited" offering for very long. 。Business models, it turns out, aren't just something you can "figure out" later. 。Business models, it turns out, aren't just something you can "figure out" later.。