This is my experience only so is likely to differ based on location (for example, salaries are so widely different in London compared to where I'm based, that I couldn't even begin to hazard a guess) and industry (I have only applied for jobs in education and small businesses - never a large corporation).

However, back when I was looking for a job a couple of years ago, I interviewed for ASP positions - same hours, same benefits, same location, etc - that paid twice what was being offered to PHP developers. If I hadn't been so much more experienced in PHP I definitely would have gone the Microsoft route.

I keep an eye on the local job market (every few months) and this doesn't seem to have changed. Be interested to hear if it's the same by you? (Are you UK based? I can't think why I've got that in my head...)