Our trekking agency was responsible for all logistics. The price included:
In 2010 the price for this was almost $ 5900 for 2 persons, which was equal to € 4000 at the time of writing.
In total (trekking agency, tips/bonusses, international flight, 5 days in Kathmandu, visa, excess baggage, duty clearance) our budget was €7300, which was almost $10,000 at the time of writing. So not very cheap for a 4 week holiday!
Although not compulsary the porters and other staff really appreciate a bonus at the end of a trip. A rule of thumb is about 15% of their wage. But since it is unclear what their exact salary is (we think between 5 and 10 dolars per day) we decided to give our porters 4000 rupees per person. That was equal to €40 or $54 per person. And that for 23 days. The reason that we gave this generous tip is that they had to cross 2 difficult passes (Tilmans at 5300 and Ganja-La at 5100 m), camp at almost 5000 meters on 4 occasions and never complained about anything. On the contrary, they were very cheerful and pleasant people. And very strong.
The cook helper got $90 (€70) and the guide $200 (€150) because he was good: he worked very hard in finding the route, he installed all fixed ropes and he was very patient with us (we were not so fast).
Totally we spent 500 Euros on tips and bonusses.