My toilet is leaking? 10 years ago I'd call a plumber. Now I diagnose the problem and determine if it's within my skill level to learn the repair (it usually is). For me, this wouldn't be feasible without online how-to videos.
A plumber/carpenter/electrician will charge me $50-$100/hr for work that I can do myself for just the cost of parts. The cost savings really adds up over the years. Not to mention, I'm getting increasingly self-sufficient as time goes on and I become more confident doing larger repairs and projects.
Most of my friends and acquaintances have fallen into the same path.