Would not recommend it.
It's called visa fraud for a reason.
In 1984, I (Canadian citizen) married my husband (US citizen) in Saskatchewan. I had been volunteering for the previous 6 months in the US through a church agency on a B1 Visitor's permit. I planned to stay there an additional 12 months. Our future plans, regarding residency, were not made yet.
Taking the advice of a senior staff person from the church agency that I was employed by (I was told by him that I had two options: apply for permanent residency, or remain on my visitor's permit), I decided to remain there on my visitor's permit while we were in the decision-making process regarding where our future would take us.
We crossed the border at Niagara Falls, heading to PA, where we lived. However, the advice that I was given was incorrect, and it was not legal, for me, as a Canadian now married to a US citizen, to remain in the US on my visitor's permit. We were, on our honeymoon, kept at the US border for 3 hours and questioned. I was accused (as a volunteer) of taking away jobs from American citizens and treated very rudely by two INS officials. I was in tears for most of the time.
They did, eventually, allow me to cross. But, I was under the impression that they did not have to.
I crossed, under strict orders not to return to my volunteer position until I had things worked out with the INS offices in Philadelphia.
Luckily, the INS officer in Philadelphia was a friend of the person who'd given me the incorrect advice. Although he confirmed that what the INS had told me at the border was correct, he was kind and we were able to work things out without too many complications. My permanent residency visa came through in February 1985, and I was able to go back to volunteering following the INS visit.
Was not worth the stress. Do it the right way.
~ Faith