We take into consideration few things here:
1) What is someone abuses the merit system with a hacked account. If the original member gets account back, will he get those merits back to spend on quality posts.
Not hard to make a report to moderator if the account of the owner is hacked
2) If someone did this one day after the merit system, it is possible he might be testing. How will such cases be differentiated from abusers.
If it was just for testing then 1 to 5 merit or sMerit can be considered, but 10 to 50? I don't think it is just for testing.
One thing also should be consider: your post could be the reason out or scape goat of a person with farming account.