I like your ECs...they arent extravagant, but they are very genuine. I feel that if you can write the right essays, and portray your personality well enough, then MIT will like you. Although it is a tech school, i know many students there with few math/science related ECs. Most do a fair bit of sport, or community work - basically what they are passionate about. I know its cliched, but once u go through the admissions process, you will realise that some very qualified students do not make such schools because they don't have anything passion to offer. In your ECs, i dont see some1 forcing himself to do things that are resume jot-downs... I like the fact that your ECs arent common, and the fact that you have taken a risk and gone ahead with them, especially the Lawn Mowing business. I mean, i know that 1500 isnt much, but the fact that you were determined enough to go along with it speaks tons about your character. I also like the fact that you arent all study focused and have a few jobs.If you can show that you are just so damn passionate and excited about the acitivities you do, whilst getting good grades, then you're projecting yourself as some one who can use MIT's education and apply it for some good in the world.
Look, you obviously dont know this, but I did activities in the same genre as you - business ventures, sports, community service, jobs and leadership conferences - and i was able to make it to MIT as an international. I think i had an edge on the ECs compared to you, but you certainly have an edge in the academic category going to a top 5 school which provied a lot of recognition. Here, you can have a look at my profile and see the similarity:
MIT, Caltech and Stanford
PS: Work hard to get close to 800s on the SAT subject tests because, even though you don't have a complete lack of math and science awards, if you are able to score well, then you ll have covered that area of your application.
I hope all that makes sense and provides some confidence boost.