I would imagine on Rec sites, they will get pissed off if you are arb'ing out of a last game on a parlay or something, but what about bigger Greek/Pinny "pro" handles, where you are arb'ing out of bets using live action and every tool available, when you have, say a $1000 parlay about to close out, but that team is up a run in the 9th, and you take $200 on the over at 3:1 ...
I've had it happen a couple of times in teh past year, but wasn't sure if they would get all pissy...