Even gamers have no real reason to upgrade to Windows 10 yet. There are a grand total of ZERO DX12 games on the market today. There might be 1 or two games that use DirectX 12 late this year.
I have made the decision to not upgrade to Windows 10 until Microsoft fixes a whole lot more of the bugs. There are so many people that have decided to jump on the Windows 10 bandwagon, only to discover that there are still a lot of missing drivers, and lots of bugs, and then when they decide to go back to Windows 7 or 8.1, they suddenly have major problems.
I do not have a second computer. If this one has a problem, I have to fix it to get it back online. And right now, running Windows 8.1, it is completely stable. I intend to keep it that way.