I hear it all day. "Mac is more creative than PC, it's for creative people."
...Actually, they are tools. A Mac is a tool and a Windows based machine or "PC" is also a tool. It just so happens that when you want to chill out and play a video game, you can actually do so on a PC, where as your selection with a Mac is far far less.
I've had my PC for 5 years or so. It still stands up to todays tasks with ease. An X6 Thunban AMD CPU @ 3.9GHz with 16GB of DDR3 memory and a recent SSD upgrade is still lightning fast if you look after it, even though it's pretty dated hardware. Comparatively, my girlfriend spent $1000 dollars more on her Mac at the time I built my rig, which has a Core 2 Duo @ 2.0GHz with 4GB of RAM and an on-board video card.
Try playing a video game on that today and see what happens. Then when it does not work, call Apple about upgrading it and make sure you tape the phone to your hand so you don't drop it when they tell you how much it might cost.
Paying someone who knows what they are doing when building a workstation is highly recommended. When it comes to relied upon hardware for day to day tasks such as servers and your daily workhorse, you want 24/7 support and a warranty. You also want someone who knows which hardware is compatible with what. I'm not talking about what CPU goes in what socket, but which matching memory type/board combo is the best for the deployment. Some memory for example, even though compatible across a wide range of motherboards may only work reliably with 3 out of 10 different boards on offer. I think in a business situation, the premium is worth it. Especially if you don't have a full time IT staff member to look after the equipment.
Linux is a waste, maybe ok for a headless file server or email/web server.
Not just maybe. Linux based file servers are vastly superior in many ways when it comes to storing and retrieving data. Linux operating systems are also getting better. Best of all, it's free.