Hmm... this is obviously a sensitive topic and while the issue of "marriage of convenience" is important, we can't forget that some genuine spouses may/can be victims of abuse. If what the OP alleges is true, why would he want to stay with her? He took a chance to be with her too, why wouldn't he be concerned about losing his PR? If this was going on in any other relationship that doesn't involve sponsorship, it will be just another relationship with problems but where there was sponsorship, we don't want to accept it as anything but sinister motives? Hmm...
Someone asked why he didn't leave when he didn't have a job? Look up the signs/dynamics of abusive relationships and you will find that alleged victims often don't leave for many reasons - for one, the OP did not know anybody and probably didn't know where to go for help. Now that he has friends, he is empowered. By the way, if the OP was female the comments wouldn't have been so harsh which is a troubling aspect about our society that seems to think men should be able to put up with abuse or that refuses to believe women can be abusers too.
I've heard about sponsors seizing passports, etc and how many times have we read posts on this forum from sponsors asking how to "deport" spouses for whatever? :-X I don't know what's going on in the OP's marriage but I think we should be cautious about making assumptions especially when there are allegations of abuse vs marriage of convenience. Staying with an alleged abuser(not saying that the OP's wife is), is no way to show gratitude.
Having kids never solves marital problems, eventhough many of us would like to live in la la land. It is more plausible that the OP does not want to have kids with her because of the alleged marital issues which is understandable, if any of us are being honest with ourselves.
@ The Scared, sorry to hear about your ordeal. I pray that both you and your wife are able to get through this and hopefully come to better place. God bless.