u should add a rankup system, it is a good idea i think, all u need to do is for example to /rankup u need ____ amount of money and for the next /rankup u need ____ amount of money but the cost would be more every /rankup and each time u rankup u should get a kit. The more u rankup the better the kit u can get. Also theres should be an aem leaderboard and top 3 gets a prize but the higher ur place in the bigger the prize is and the leaderboard should depend on zombie kill i meant *Rankup* in the title sorry for the misspelling
hope you talking about non donator rank, cause it remind me of faction ( has rank system for ingame, basically /rankup gives worthless to greater stuff you get ) but if you talking about donator rankup for amount ingame money.... that ruined gameplay imo.
I agree with @Devonkelly about the non donor ranks. However, once you have played/voted enough on the server you get enough diamonds and cash to create sets of Ub3 diamond armor. It would be an interesting system to see, but I don't think it would be used that much.