Hi Mario, you have asked a very good question here and the old saying, "You get what you pay for aplies to this situation." Why would thousands of people pay more for a motor while there are others out there at much cheaper prices. The OS 61 is one of the best user friedly engines you will find bar none. It is a bit heavy but makes up for it in reliability and quality. I have had two of these fine engines and have expierience with other engines also. This engine draws fuel so well that it will continue to run even if the pressure line is blown off the muffler. Also it will start and run even when a newcomer hasn't even a fathom of an Idea how to adjust needle valves. The only other engine I could recomend over this engine is Saito.