I see a couple issues with this suggestion.
1. This server is run of donations, no donations means no server. To make it worth wile for players to donate we have perks like mining spawners for elite+ and /fly for ultimate. If we were to give the mining spawners ability to lower ranks that would mean that people wouldn't want to donate for a higher rank, because it is not worth it without that perk. Of course people would love to have the ability to mine spawners from day one but sins we need money to run the server we can't do that.
2. Some of the fun on meep is that we have rank sellers. If you buy ranks from rank sellers you do not have to use IRL money and by doing that you are still helping the server. Working your way up the ranks is a part of the fun on Meep in my opinion. If we let everyone start with everything I do not think we would have such a great community today.