I was met with some hard gatekeeping today on a $1M SDE deal with an asking price of $2.5M:

"To qualify for this opportunity, the potential buyer must have at least $1.5 million in liquid assets and $4 million in total assets. Please provide proof of funds showing at least $ 1.5 mil of liquid assets."

Is this a joke? Unless the seller is looking for cash, why would he ask for this? Any suggestions on how to politely respond? I don't have that much liquid funds but can raise if necessary.