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Where any broker will take you since you give them a cut from your commission or pay a fee per transaction.

Would we see increased cross-border transactions and a surge in property investment opportunities?

Normally when a  property is advertised as "cash only" the property is in poor condition and/or the seller wants to reduce contingencies and opts for a cleaner transaction.

Do they want the transactional expert or would a relationship be more valuable to them?  

I have been doing this since the mid 80s  over 3500.00 transactions and If I can do it you can do it :)

Arbitrage is simply transactions.

Look, I am rather regimented when it comes to hard money; that a HML should ONLY ever be used for short term transactional purposes. 

Are you self-funding the transaction or will you be using a lender?

ATM business mainly makes money from the transaction fee.