I think MD10PLT makes an excellent point, one that I missed: if buying big jet sim time or getting a type rating increases your self-confidence and comfort with the civilian flying experience, then by all means do it. I do think being confident, and comfortable during the interview is a huge advantage for any interviewee and worth the cost. And getting it along with the certificate if that's the road you want to take seems like a good deal.

I'm glad to hear others interviewed with a 737 type rating and did not have their intentions questioned.