WOW... $200 per filter? Sure have gone up in price! I shoot daily and never, ever use a filter. My philosophy is that it is one more optical layer to go through, and I always cap both ends of the lens anyway, so I don't worry about getting anything broken and always use a strap when using the camera, so don't worry about dropping it. Never had any issues. I think the only time I would use a filter is for creative purposes for something that can not be done in Photoshop, so basically, I never, ever use a filter.

Allow me to reiterate what I've said for several years after testing 6 different filter manufactures filters. Filters used in this setup included but not limited to B&W, Lee, Tiffen, Gobe etc. After testing.. None of the Polarization or ND filters worked on my Canon M6 camera. No mater what the settings or condition, Neither the CPl or The linear filter would achieve any desired effect when taking photographs. I say this cause be mindful of who you sell your filter to as some of these filter will not work with some cameras again like my M6. There has also been others here and other forum sites claiming they to are having to deal with filters that simply do not work on their cameras. This all boils down to cameras like mine already have filter type settings integrated into each shot so a hardware filter is not needed.

Because of my years worth of testing and discovery, I've taken on creating my own filters in order to achieve the desired effects. My first successful attempt came while using a space aged yellow materiel, which wasn't designed to be used as a filter.

Because of this successful test of the yellow filter, I'm currently working on a fixed (35% -45%) polarization filter. Both the yellow and polar filters are 85mm x 100mm and fit into a Cokin lens mount. I can't say I'll place these filters on the market anytime soon, but I may start looking for product testers here at the forum and other photo forums.

So if the filters you have currently work with your gear, keep them or if you feel you want to sell them, be prepared to have some photographers send them back or want their money back cause they wont work on their set ups.