safety and injury prevention is a huge factor.
if you havent lifted safely for a few years and made gains, managed those gains and kept those gains safely you can be in trouble. if you havent learned how to deal w/ things like colds, stress, injuries, short workouts, break ups, being dehydrated, etc etc you could be setting yourself up for an injury.
you should also know what program/diet combo works best for you by trial and error.
when you train naturally for just 1 year you SHOULD make gains that are basically comparable to a good basic cycle. so adding roids wont help much.
training naturally will help get your ego in check. when i started lifting i felt like super man the first few months.. then i trained w/ people that crushed me and humbled me.. and helped me get set up for a great future in weight training.
etc
etc