You know what, I'm instinctively resistant to the idea of banning activities between consenting adults - the clue is in the word 'consenting'. In theory, it really shouldn't be that hard to persuade me to support surrogacy or at least oppose making it illegal. So, if you would like to knock me off my fence, here's what might help:
Firstly you could explain how we can ensure the mother gives informed consent. I think one poster has suggested some form of compulsory counselling beforehand. That sounds like a start but what about a situation like the one in this thread where it appears the mother had never given birth before? Do you believe informed consent is ever possible in such a situation and, if yes, how would you ensure it?
Secondly you could link to some science that debunks the mother-baby bond. This seriously troubles me and, as has been repeatedly pointed out, there's a world of difference between breaking the bond because there's an emergency, and doing so intentionally.
Thirdly you could have a go at tackling some of the questions in NotBadConsidering's post about what happens when things go wrong.
Here's what is not persuading me:
The homophobia accusations. Christ on a biscuit, the reason gay men cannot give birth to their own baby is not homophobia, it's biology.
The 'what about adoption / what if the baby needs ICU' posts, all answered numerous times in this thread so, if anyone repeats them, I'm going to assume you've not bothered to read the thread and therefore wonder why I should take you seriously.
The 'I know of such a case and it worked really well' arguments. I'm sure we can all think of situations where we've behaved recklessly, potentially harmfully, possibly illegally and it's worked out fine. That doesn't make the activity is a benign one, it means we got away with it. I refer you again to NotBadConsidering's post.