Internet, hot shower and an upgrade in service can cost increase your expense a lot while staying in the Everest region. This is because most of the route lies in an extremely rural area with no easy access to the rest of the world. Even buying bottled water and snack can cost you a lot. If you want to trek with only simplistic services and bring your own snacks from Kathmandu, use water purification tablets to use tap water, it can help you keep it low budget. If you are okay with no internet and modern devices for 14 days, you will save yourself some good money.