Well there are different things tourists look for... Kathmandu is cheap, language problem isn't a big deal(you can easily find people who can help you), there are historical and cultural sites from hundreds of years ago, and even mountain peaks are visible... and of course, nagarkot is pretty near... Kathmandu is a mix of 21st century modern amenities and barbarian habitat...so its a fun place to be...remember it used to be the place for hippies..still that age is possible in ktm...cheap prices...great fun..n independence... So ktm can attract a diverse array of ppl..