They’re more work to manage and have a time overhead compared to someone at the office is a big part. It’s also easy to forget and ignore remote workers and it can be harder to evaluate their productivity. A culture that has a mix of remote and non-remote has the remotes pretty isolated as the normal way of communicating things has them left out. (source)
Instead of taking the mediocre candidate in your area, you can hire the superstar who lives on the other side of the country. Limiting yourself to hiring within your locality restricts you to a small talent pool. You may be forced to settle for mediocre talent simply because you need the position filled. Companies that hire remote workers have a larger pool of top-notch talent. - Eilon Reshef, Gong.io
Employees who have virtual offices or telecommute work more hours than their office counterparts. People who work in a virtual office can often blur the difference between home life and work life. Unlike employees who can leave work at the office, employees with virtual offices tend to continue to work outside of "normal" work hours. According to a report from the Bureau of Labor and Statistics, 50% to 67% of telecommuting hours push the employee’s over 40 hours a week.4 Some reasons for these additional hours could be the employees’ desire to justify their telecommuting by being more productive and continuing to work beyond business hours or a result of companies maximizing their salaried employees by providing them with virtual offices to be able to continue work outside the office.