Maybe tell Rick that this is the one life he got to live, nobody knows how long it's going to last, and he should think about respectfully using this gift instead of thinking about cost-overruns. Maybe try to find out his dream and help him realize it, too. He has to switch modes from wage-slave to retired-and-rich-as-fuck.
Yeah, it seems that anyone is still going to need to account for budgeting decisions and to keep track of moneys, especially the larger purchases.. so for example, if based on finances, there was a decision to buy 200 acres, and then after considering the physical layout and various practicalities of "wanting more", there was a decision to buy an additional 40 acres, sometimes larger purchases are going to trigger a need to reconsider financial matters, and if there was enough money in the petty cash fund to cover the 40 acres, then there might be questions about replacing money in the petty cash funds to cover such a likely large withdrawal.
Sure, sometimes there still can be assistance from accountants, but still there might be some considerable difficulties to completely forget about money and just live in a way that is "rich as fuck."
I don't claim to be any kind of expert in regards to figuring out how to spend some moneys, and sure there could be a certain amount, such a $1million or $2million that ends up going into a "do whatever you like" fund, and but I really doubt that the whole budget can be ignored, even if there were $100 million in the fund, if you go out and start buying yachts and planes without really considering maintenance costs and staffing costs, the funds could get depleted if they are not categorized and attempts are made to contain some costs.