Since OP said that he will add esport but he still not do it yet and I also doing comparisons on esport too. I decided to shared it here.

I have to included 1xbit here because It provide biggest coverage in esport. Can't skip them sorry.

ESPORT:
- = Not available.

|	Sportsbook	|	Match Winner Margin	|	Over/Under Margin	|	Handicap Margin	|
|	Buff88	|	5.88%	|	6.25%	|	6.21%	|
|	1xbit	|	7.40%	|	9.77%	|	8.56%	|
|	mBitCasino	|	5.88%	|	6.25%	|	6.21%	|
|	Nitrogen	|	5.97%	|	-	|	-	|
|	Sportsbet.io	|	5.90%	|	7.86%	|	7.97%	|

Now compare with real money sportsbook.

|	Sportsbook	|	Match Winner Margin	|	Over/Under Margin	|	Handicap Margin	|
|	bet365	|	7.61%	|	9.11%	|	5.79%	|
|	Pinnacle	|	4.87%	|	-	|	4.78%	|
|	gg.bet	|	5.53%	|	7.53%	|	7.41%	|

Overall: esport have extremely high margin. Even Pinnacle have 4.87% margin. I hope in future some sportsbook can step up and give better margin than this.