Is it that bad to offer low prices for popular leagues? That's what most people bet on, so I think it's fair to expect good margins on those. Sure, I can add some limit information:

For Utah Jazz to win ML tonight @ 1.6, everybet lets me place 311 mBTC on it to win 186.7 mBTC This is at a 6.94% margin.
On Nitrogen, I have a max win of 2500 mBTC (4030 mBTC wager) on odds @ 1.634 for the same outcome. This is at a 3.7% margin.
BitcoinRush has a 2.62% margin and has no issues taking bets of 500 mBTC+ on NBA once the event is less than 2 hours away from starting.
Cloudbet has a 2.8% margin on Utah to win @ 1.65, with a max bet of 3564 mBTC.

I'm simply pointing out that their margins are not competitive for popular events. Most/all other notable books with lower margins offer higher limits on NBA and likely other major events. None of them offer limits with $10 max bets, and instead up to $15k max bets. Everybet may have better lines for more minor stuff (1.89 evens in Live which is decent), but I've also noticed them being marginally worse than Sportsbet.io for minor events like Handball Champions League.

I agree that it's not completely fair, but these margins seem to be consistent among other popular events (unless they changed in the last few days). What comparison methodology would you suggest that is completely fair?

edit: I'm not asking them to have 2% lines; something like 4% with occasional promotions would be a decent book. I cannot recommened anyway play at a 7% margin book, regardless of limits.