I think the biggest thing people need to understand that it's not a 3rd party paying bookie just taking bets in wagerr. No other coins can be offered because you are directly betting against the wagerr blockchain. If you lose coins get burned, if you win coins get minted. Overall due to gaming theory the house (blockchain) will win over time. So the blockchain will continue to burn circulating (and therefore max) supply.
"Due to gaming theory the house will win over time" : what do you mean by that precisely please? Why would the house win over time if there is no House Edge (vigorish)? Moreover I have a question, who is fixing the odds of the bets? Can anyone offer lay bets like on betting exchanges?
There is a house Edge, it is just very small. Comparable to the likes of pinnacle.
The blockchain is who is 'taking the other side of the bet'. The odds are set by taking an average of feeds and then using an algorithm to help balance the book. As more volume comes to Wagerr the plan is to not use any feeds at all.
Users cannot lay bets currently.
I don't fully understand what you mean, is it a human or a bot who is setting the odds currently? How odds will be set when feeds will not be used anymore? It would be more interesting and more decentralized if the sportsbook was also offering some mutual bets IMO.
For the margin you're right it seems to be pretty low (about 3% from what I see)