I think a cool addition to the server would be a plugin where players could offer loans to other players and charge an interest rate. This would be a good possible source of income for established players and offer less established players a way to fund the cost of building a base. The lenders can choose how much money they would like to loan and set an interest rate percentage, similar to how mule jobs work. Interest rates would be payed daily by the borrower, and if the borrower does not have enough money in their balance to pay the interest, it adds to the principle amount. Lenders could also set a maximum amount of time for the loan to be payed back. Borrowers can choose to pay loans whenever they would like within the time period. Interest will be automatically taken out if the borrower chooses not to pay any that day. There could also be a credit tracking system that tracks if players are paying on time or not, similar to mule reputation. Borrowers can apply for loans and the lenders can choose who to loan money to based off their credit reputation, and other factors like online time, join, date, and other data that could show how serious a player is about playing on the server. There could also be an insurance system that pays back a portion of a loan to the lender in case a player goes inactive while still owing money. I think this would be an amazing, unique feature that would introduce investing into the server. I sometimes see people requesting loans in chat and I think it would be a very useful plugin to have.