To talk about these tights/pantyhose questions is even difficult to discuss without the belt topic. I have heard and read much of this comments in women fashion talks too. What I can bring into this topic is, that there is a big group of women that still do not like to wear. They still hate to wear and thats ok.
Not every female body is the same, so there are always differences how the ph fit, so likes and dislikes are here too.
There is a difference on western countries and eastern countries, Women from countries with Slavic language seem to wear them even more often in the past, but nowadays the younger western countries do wear more too.
Like Ines mentioned, the price is always something to be noticed too. So you can go the cheaper way or spent more money in better quality.
Manufacturer: I discovered that you can get a good quality hose and a poor one even if you buy two similar pairs. That sometimes let me ponder.
So this get me to how often to wear...could be one time to a good year, then you can see that the ph is used and she bleached out from washing.
Washing the hose: i´ve gone over to wash them by hand separately, no wring out and dry by air.
I used to wear tights with 60-80 den just to prevent uninvited views by skirt accidents and because of age 🙂.
I prefer to buy not the cheapest ones but quality for a reasonable price.
Hope this helps a bit.