Interesting theory - i too upvoted on some that you point out deserve upvoting, as well as yours!
The travel ones are good to read and view pics as for some people it might be the only way they will ever get to see 'far flung places' and for others thinking of 'gap yearing, sabatical or just plain travelling' then its gives them an idea of where to go. I for one enjoy @heiditravels as she writes interesting content and her pics are usually superb.