Why would any farmer in California ever sell their land (to which the water rights are linked) for ANY single payment? Or, really, why would any landowner anywh

Why would any farmer in California ever sell their land (to which the water rights are linked) for ANY single payment? Or, really, why would any landowner anywhere, getting money from rent, would give that up for ANY single payment? Of course, there is a price for that. Even a truly perpetual guaranteed income stream is worth a certain finite single payment, that's how rates of return work given the standard assumption that future money is worth less than cash in hand now.