For what one gets in W10 Pro (only BitLocker, Group Policy, Hyper-V - and no longer any AppLocker) nowadays, the cost is unjustified for the vast majority of typical home users. There's nothing particularly special about it, unless you have a specific need for a particular feature.
A cheap license - well, it's OK only if the license is a valid one - and that's always a risky affair. W10 Pro licenses are the most abused, manipulated WIndows licenses available on the market.