Members who rate the topic with merit points will select the most 5 ratings from them for direct entry into the campaign
While OP's idea looks good, the quoted one doesn't. And it is also mentioned twice. Be careful OP, this can be considered as merit begging and may lead to negative feedbacks. I'd advise to remove the part related to merits, in order to avoid such an unwanted outcome.
Just as I also thought. I was wondering how do merits will help him for the success of his promotion. I also advise the same.
5- The first five members who put merit points for this current topic will be selected (this option is not mandatory, but it increases the member acceptance rate in the advertising campaign)
This will somehow considered as merit begging. Signature and other advertising campaigns doesn't require to put merits on the OP, even If it's not mandatory, you shouldn't be talking about merits in the first place.
As mentioned above, this may lead to a negative feedback to your company.
Hope you guys will find another way how to promote your company other than going for the merits (which is totally irrelevant to your promotional campaign)
Good luck to your campaign, I wish you all the best.