Well brother if everything you said is true ;sounds like you can do better anywhere you go...!

If I were you, I would not think for a sec. I would definitely do it.
If you ever feel like, you did the wrong thing, America will definitely welcome a genius like you. :)

 did you mange to save 30 lakhs in Nepal, buy land and save enough money for average marraige all while being on student visa in USA for 4.5 years? 

 us_nep ..your plan sounds really good and glad to hear that someone wantd to go back. You should def go back but don't forget to take Nepal's political and economic situation in account before you make any kind of investment. Wish you success

US_Nep,

Like others have mentioned, from what you have posted in your initial post, the arguments for going back to Nepal seems quite strong.
What are the reasons that you would even consider being in the States? In your circumstance, what are the positive reasons why you would stay in the States?

 this is the wrong place for your query. you should talk and seek the advise of your parents :) and just for the heads up, your 30 lakhs might be a huge sum to go shopping in nepal, but isnt much if ur thinking about getting married , building a house and starting your business. 

best wishes :)

mahodaya  us-nepal , 
                                       definately its wrong decision ur making there is no doubt in that debate in anyways u want . timro aafno faida aafno ramro ko lagey chai teme le us mai basda ramro ho tanna poisa expensive car ghar swimming pool ini haru materialistic ananda hun jun kura temele pakkai pani nepal ma paodainau paye pani alikati dherai mahago sulka terera matra paochau . hamro samaj ma testo guf dine nepal gaera yo garne ohu garne bhanera dherai aaounchan tara actually nepal gaera saphal ta paone ekdamai thorai chan mero aghadey testo garne byakti ko odaharad eauta matra cha ti maha nayika hun karishma manandhar, bhuwan kc etc  unle yahan ko materialistic sukha chodera phirtaa gain . ra temele pani yo phirta jancho bhaneko malai guff deko jasto matra lagio .
                                      its different thing though ya ofcourse nepal nepal educated not only educated guys with some sort of skills talent definately hamro nepal ma unskilled manche haru thuprai chan ya definately nepal need guys like u pakkai pani for good of nepal but the thing is its good for nepal only bcause there is no way u will make same money as u make now . 

                                      its good decision ur gonna make but the thing is ur just making us fool because many people do because they get some sort of ananda doing that . sorry don't believe u gonna go .