I've been flying RC on and off for 30 years. I also wondered just what use I might have for a sim. Well the LHS had the XTR on special for $100 and I just could not say no. I thought my kids might have some fun with it.
They are GREAT.....I get use my TX and practise what ever I want to for as long as I like. I've already started learning new things and putting them into practise at the field. With the amount of fun I've had with it I can only imagine how much help it must be to those flyers yet to solo for real.
I think that if they ever reach a better price point ($200 ish is too high) most flyers will have a sim in their fleet.

Barry