So basically merit is not worth more than posts. I still don't understand one thing, did I see a thread earlier that said "I bought 10 merit, will give to different high-quality posts", can you actually buy merit and if so what is the point then?
Sales of merits on this forum are generally frowned upon and you will usually be tagged with negative red reputation if you're caught trying to buy merit, and merit is absolutely worth more than posts if you're interested in ranking up on this forum, as merits are a requirement for ranking up as AhmadM quoted. The post you saw before is likely a sort of merit giveaway where people quote their 'best' posts and attempt to get merits for the posts in question, not a merit sale.