Not that many people sleeve the damage deck anyway. Any kind of sleeves will probably distinguish your cards from most others.
Strangely enough just about everyone my way uses sleeves on them. I only go to one or two OPs a month these days, but through Resistance is Futile I was going to 4 a month. Without sleeves the deck would be pretty beat up by now.
Even with sleeves I went to an event about a year ago and when I got home I counted my deck and had 3 extra cards. I checked with everyone the next month and nobody said they were short, but they had to come from somewhere or maybe they are like Tribbles.