Re: Rare pragmatic response
I doubt it was really cheaper. More than likely, they designed their new site without proper thought and then realised "oh shit, it doesn't work on IE7 and all our customers use it". And now it's cheaper to do this than rework it all.
They probably let some bright-eyed graduates on the job, who were determined to do the whole thing in the newest web technologies just because they're new and cool.
It's a recruitment site. It doesn't need loads of HTML5 and a super-efficient JS compiler. It shouldn't anyway.