Here's why:

* Extreme conditions: The summit is exposed to incredibly harsh conditions with extreme cold, strong winds, and low oxygen levels. It's not feasible to build structures that can withstand these conditions for extended periods.

* Altitude: The summit is at 8,848.86 meters (29,031.7 feet), making it the highest point on Earth. The thin air and extreme altitude make construction and maintenance extremely difficult.

* Environmental concerns: Building permanent facilities would significantly impact the fragile high-altitude ecosystem.

However, there are temporary structures and supplies available at higher camps:

* Base Camp: Located at 5,364 meters (17,598 feet), Base Camp serves as the starting point for expeditions. It has tents, toilets, and a dining tent.

* Advanced Base Camp: Situated at 6,500 meters (21,325 feet), this camp provides shelter and supplies for climbers before their final push to the summit.

* Camp IV: Located at 7,900 meters (25,900 feet), this camp is often used for acclimatization and as a final resting point before the summit push.

It's important to remember that these temporary structures are basic and designed for survival in the extreme conditions, not luxury. Climbers are responsible for bringing their own equipment and supplies, including tents, sleeping bags, and food.