Many collectors are a fan of toned, original coins. However, most collectors don't just like all types of toning, but they all a different taste when it comes to the type of toning.
Rainbow toning, which is formed of many different vibrant shades of colors is often very attractive and people will pay a premium for the toning, but some collectors won't.
Some people find the light golden toning on CuNi coins attractive, some do not.
Some people find dark, steel-gray toning on BN matte proof lincoln cents attractive, but some collectors will prefer full Red.
So most times it's really about the certain types of toning that some people find attractive and some do not. The yellow, golden toning on the half may seem attractive to some collectors, but it could be found unattractive by other collectors. I personally find it a bit on the unattractive side--black micro spots all over the surface.
It's all about the preferences and tastes of a collector.