Really, I don't understand what 'spam post' is,
That's the problem 
Let's count your Merit earned per post:
User rijaljun (full history)
- Received a total of 10 Merit up to last Friday.
- Received 0 Merit for 0 of 480 posts created before the introduction of Merit.
- Received 10 Merit (100.00%) for 3 (0.25%) of 1163 posts created after the introduction of Merit (0.0085 Merit per new post).
- Received 0 Merit for posts that are now deleted.
I have ever found a member posting with long characters and got merited, and that post was low quality (in my opinion) because he just repeat the same statement.
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I think it's good to add the reason instead of just deletion notification.
Reporting and removing posts already takes more effort than the average spammer puts in to post it.