Besides Server and possibly workstation application is there really a necessity to have more than 32GB of RAM in a home desktop, even more so at 64GB of RAM. I've had 12GB since the launch of X58 and have never needed more, let alone 64GB. The only logical application for home use would be a RAM Drive, other than that I see it as a waste of money to equip a system with so much RAM you'll never use. Not to mention by the time you are using all that RAM the rest of the system will likely be a bottleneck. Back in the day you rated a computer based on how much RAM it had, just people who don't know any better still use that thought process when buying new computers, and sadly that's the vast majority.
My 7 years old laptop has 16gb of ram, and I was struggling with it, so I had to go for desktop, It supports 64 ,I have 32. And not all but few people do need that much ram, If you are a data scientist , BigData Developer,you will need it. Obviously, you wont like to have two different systems. one for entertainment , one for your home projects/POC/learning. I use it so that I can run 4 virtual systems running hortonworks in a cluster, I need 6 data and 1 master, I.e. total 7 , but I am managing with 4 , due to less ram. so it is needed .
I posted that comment years ago, I had eventually gone to 24GB on that X58 platform but have since retired it from main use and replaced it with X99 and 32GB of RAM. Nowadays I'd look at 16GB as being the minimum for even a gaming system let alone a workstation or a system used for virtualization, certainly in those situations your going to want as much RAM as possible.