[selmat]

Especially time is most valuable resource. As you said outsourcing is solution. Almost all areas are so developed that is not in power of one man to be an expert in all of them.

When results are desired and there are deadlines, i cant afford wasting of time with trail-and-error approach for example with gui design. Even its interesting area.

This is also called opportunity cost. Famous footbal player will not cut his lawn even he knows how to do it (besides he dont wanna do it). He focus on more important things. And this important things helps him earn more money and outsource other things. And (sadly) money is root of everything.

After few years i have found out that dealing with issues during side projects increase my value in my proffesional life. I have experiences what can go wrong, where can be possible bottlenecks, which issues are just warnings (almost nobody is interested in) and which one are errors and have impact to business. This helps me a lot to take better jobs and contracts.