Good points made as well. I am still in the camp of "they are overpriced" but I consider myself pretty handy and mechanical. And for someone like me, it is an expense I am not willing to pay. However, you do get what you pay for. Those of you that have posted pictures of the cabinets you bought, I can see how well done these are and they are very well made. So if someone does not want to build one for whatever reason they have and wants a good product that they can enjoy, a premium will be paid, like anything else. It is a niche market and to build one is time consuming and does take some skill and knowledge and so paying extra for that to be done so you can be handed a "turn key" cabinet is worth it to people. So other than building, you have 3 options..
1.) Buy one built by an enthusiast like myself. A one off, possibly original (mine was am EM cabinet design - not as desirable as SS but took up a smaller space and I never intended to sell), that can have quality of crappy all the way to amazing as far as build quality. Can have similar parts in it. Will most likely be more affordable. If local, you can try before you buy.
2.) Find someone local that will build it. You can customize it how you like and what your wallet can afford.
3.) Buy from a manufacturer or known builder. High quality parts almost guaranteed. Most likely very expensive. End product will most likely be amazing. Possibly no option to try before you buy, dependent on location.
Personally, I never expected to want to build another but a few things happened. My mom and dad came to me and asked me to build one for them. Someone else wanted something I built! Yeah, they are my folks so they are biased but that is a cool feeling. And second, when the guy who bought my cabinet came to pick it up, he asked if I was going to build more. He mentioned my design was great, execution was great and saw it as an opportunity for me to make a few bucks, so why wouldn't I want to do that that was his thinking. So here was a complete stranger appreciating my work, which I thought was just OK (but I am critical of myself to a fault sometimes). That felt amazing. Couple that with know thing something I built was worth money to someone and now they are enjoying it in their home... really amazing to me. It is a labor of love and seeing someone else appreciate that is a great feeling.
So again, I do recommend that if you have friends who are handy or you are handy, it is worth the try to build one yourself. It is an amazing journey. if not, and if you got the coin, you can't go wrong with buying built from a known guy or company. Just look in this thread at some of the amazing quality of cabinets people have purchased as well as how they feel about them.