There are some things that a sim wont teach you. Even the RTF airplanes will require minimal set up and maintenance. There is quite a bit of trouble shooting to do when something stops working as well. A sim will get you pretty close to jumping into flying an intermediate plane, but there is a tad bit more to this hobby than flying (even if some people pay lots of money to avoid it).
Back in the day, people would start into this hobby with a .40 size trainer. Its not unusual for these trainers to have 65+ in wing spans and even budget .46 size motors will pull these planes faster than most foamys fly. For the most part they are pretty aerobatic as well (of course I tend to do low inverted passes with J3 Cubs as well).
Something like this
would not be out of question for someone with a ton of sim stick time. I doubt you would get bored of it any time soon. These larger/faster planes are not considered park flyers. Well, by the AMAs definition anyways. They can do quite a bit of damage to themselves, and more importantly, to people and property.