At best youll deprive them of a few key resources, at worst (and more often than not), youll make their deck more consistent by trimming the fat
If you can tip the balance of the scale either side by an arbitrary 10% then you get a value of 6 by improving your strengths and only a value of 4 from your weaknesses
But if you want the strongest all-around platform for long-term card selling, eBay is the better primary marketplace.
This is true for my unlimited edition Base Pikachu, my 1999-2000 Base Pikachu, my Shadowless Red Cheeks Pikachus (both 1st / non-1st), my Japanese CD Promo Pikachu, etc
This includes editing using Sharpness, Contrast, Shadows, Hue, and many other tools
There are different types of sleeves that cater to different needs