One thing is for sure, you will get between 100 to 400 bonus votes for your site or server depending on what Premium pack you purchase.
This, in most cases, will increase your rank. The greater benefit is on the 1'st day of each month when we reset all votes to 0 and your site will have those up to 400 votes already.
Your site will also keep a better ranking even if you have a low number of incoming votes. Players tend to click on highlighted premium listings that have banner images but we can not
guarantee a minimum amount of visits and also we can not promise that your server population will have an immediate grow.