Personally I don't think it's about time or cost. Just consider, as already stated that it's really two different hobbies. Modellers enjoy a good build, rc pilots enjoy a good fly. Some enjoy both. Nobody is better or worse, just different aspects.
I'm a builder but have no aversion to ARF's. My second trainer was an arf; after the first one refused to repell the ground

I've built all my others solely because I enjoy that part of the hobby.
We had this discussion at my field. I took on a challenge as I'm a slow builder because I hate to rush.
The deal was to start/build/cover and fly a Sig Fazer in 14 days.
It can even be done quicker but even I was amazed how quickly things went together. Anything is possible, just enjoy the hobby.
Bob aka Nuker