If you have a board on ignore, when you look at a merited post it shows up as deleted/ignored. Even if xandry merited some posts that got deleted, so what? If you're insinuating that he's selling merits or somehow giving them out inappropriately, I don't see the evidence. He's given them out repeatedly to some of the same individuals, but look at how many times pugman or TMAN has given me merits. They just like some of my posts, and I think the same thing is going on with xandry.
The posts that he is meriting are for reporting the post, and letting the person who infringed the guidelines know what they did wrong. Here's a quote of Xandry's reply which was translated by the user "esmanthra" here
I've voiced my concerns, but also came to the conclusion that what Xandry is doing is probably fine in the thread TryNinja linked.
Regarding the possibility of obtaining merits this way. Here're some situations when I don't give them:
1. You were wrong and I do not see any violations.
2. You wrote a message with an explanation, but I trivially did not read it.
3. You didn't reach even a Jr. Member rank "naturally".
3. You collected too much merit in the last 30 days, try again later. This is not my personal limitation - it's set by the forum.
Therefore, we have some kind of game of chances here.