This is something i believe that every gambler should already know and be familiar with, but then, lets not forget that this whole facts about the house having the higher edge over the gambler, this on a very large extent depends on the type of games the gambler is playing, personally, i think house edge have nothing to do sports betting - correct me if i am wrong though, but house edge have nothing to do with sports betting, as winning in sports betting, (no matter what the setting of the house be, or how ever it is programmed,) depends solely on the players knowledge of sports and how much luck they have on their side.
I agree with you on the fact that house edge have nothing to do with sportbets most especially football and other live sport events, but house edge will play significant role in virtual sportbets, since in virtual games is the gambler against the house like every other in house casino games where the house edge is applicable and practicable.
So it all ball down to which sports event you choose that determine whether the house edge will play a role or not.
But like premiere leagues prediction and bets, such third-party events are out of the control of the casino.