Shouldn't be an escrow need to have enough money of his own before performing an escrow in a marketplace?
No, can't change what has been practiced with, it's still all about the "TRUST".
If someone has the capacity to pay, but will he be able to produce the same amount of the total amount under escrow? or would the escrow be willing to escrow his funds also to ensure payment if something bad happens? I think things would be more complicated and it would be better to look for an escrow company that could ensure the security of funds, if we follow that, it would mean that the contracting party has to pay a bigger service fee which is not viable in most transactions.