The reason *Opinion Based (OB)* is used too frequently to close questions. Two examples:

[Why are long distance trails so much more famous in the US than in Europe?](https://outdoors.stackexchange.com/questions/20449/why-are-long-distance-hiking-trails-in-the-usa-so-much-more-famous-than-in-europ)

[What top items did the teams competing on the TV survival show *Alone* most frequently choose?](https://outdoors.stackexchange.com/questions/20463/what-top-10-items-did-the-teams-competing-on-the-tv-survival-show-alone-most-fre)

Neither of these has been closed, but both received VTC. 

In the second case, the VTC probably came from quick, sloppy reading. As @Charlie Brumbaugh said:

> 
> How is this opinion based? If this was asking what 10 items to bring
>  it would be, but this is asking which items they do choose and
>  hopefully that information is recorded somewhere.
> 
> 
> 

In the first case, I postulate that the OB VTCs came from people who did not know much about European long distance trails, and so it **seemed** OB to them. However, a person knowledgable about European trails gave an objective answer, backed up by pertinent information. As I commented on the Q: 

> 
> this Q is not primarily opinion based; the accepted answer
>  demonstrates that there is a good objective answer to this question.
> 
> 
> 

There are many more examples I could find, but it would take a lot of time.

So, my plea is:

* Read a question carefully before you VTC.
* Don't assume because **you** can't think of any but an opinion based answer that a person knowledgable on the subject cannot write an objective answer.

Of course, there **are** opinion based questions. With apologies to @James Jenkins, **if** he had asked

> 
> How should I cut my toenails on the trail, with a [nail
>  clipper](https://outdoors.stackexchange.com/questions/20464/how-to-keep-your-fingernail-clippers-together)
>  or with my multi-tool knife scissors?
> 
> 
> 

**that** would have been opinion based.

Of course, JJ's question was different, but there have been similar questions on TGO properly closed at OB, but I do not have time to search for them.