"Single, double and triple Sleepbox units are available at prices starting at EUR 7,000 ($8600). With an average annual income of USD 30,000 per unit, investments pay back in six to nine months, the company says."
Assuming a 100% load factor, and assuming someone is on hand to change the linen and keep it clean.
Being more realistic, it might be cash-flow positive from the start and turn a profit after the first year, if you put it somewhere popular and get the cleaning/maintenance routine nailed down with decent cost control in place.
From: http://www.springwise.com/lifestyle_leisure/sleepbox-helps-t...