It sounds like you have way bigger issues than a "visa" right now. Maybe focus on your marriage first. Then, focus on applying for a green card.
Honestly reading this makes me really sad (and kind of angry). There are people here who would do anything to be with their spouse and be together FINALLY. And here you are worrying that your "immigrant" wife is going to take financial advantage of you.
Yes, sponsoring your WIFE means you accept financial responsibility for her. If you are not ready to do that, don't waste anyone's time (the government's, yours, or her's).
Rant over.