If great sounding amps can be built with so few parts, why are most commercial offerings so complex?

What really matters is simple, does it make you happy? Does it look good and sound good to only one person, you. I don’t by stuff to impress anyone but me. I used to chase THD and power but have come to realize it makes no difference if it do sound good to me. I make simple low powered single ended tube amps that I love. Used to build monster SS amps whos specs would impress nerds but sounded lifeless to me. I have now come to the simple is beautiful part of my life. If it must be complicated so be it, like my AMG GTC but I like my amps simple. Others like a 62 Falcon and theirs amps are more complicated than the space shuttle! It’s all about what you like not what anyone else thinks.
 
This is what I consider to be the reason for retail establishments. The cost of admission will be higher, but with proper guidance a client can end up with a very satisfying system and possibly an education in how to listen. Of course as in all things this would necessitate finding a quality dealer, not always an easy task. Personally I approach the process with the thought that if its fun we're on the right path, it doesn't really matter what my reasons for owning are, just that the client has an enjoyable experience and finds ways to connect with their music at deeper levels.