Should the sam rule apply, more seriously, to merit?
Yes, no, and maybe.
There are threads where people actively search for recommendations on posts to merit, going there and suggesting posts (even if they are your own) is alright, it's even wanted. I dont see harm in it.
Another case would it be when you are sending unsolicited PMs to people who you suspect to have big amounts of sMerit. Here it should be 100% not allowed. Aggressive begging cant be tolerated.
When it comes to a post/thread, imo it depends on the content of it. Some threads currently ask for donations, and that's OK. They could ask for merit donations instead of BTC donations, I would find that OK.
Some threads have avertisements, and that's Ok, similar situation. This does not apply to all threads/posts alike, I think it's something everyone has to determine for themselve individually. Find your own line.
I just came across a post where someone explained a simple idea and then said "if you like my idea, send me merit." There is no negative merit, so an ask like this seems more serious than asking for trust.
An easy way to punish them is not giving them any merit, even if the post would deserve some.
wow this Merit topic is on every thread in Meta, someone please start subreddit for it already
15 minutes of fame. In a week, everyone will get used to it and it's business as usual, hacked accounts and banned spammers.