They're an offshore book. According to their site their web server is hosted in Gibraltar.
None of the money you bet with them makes it into the pools. This can be good in that you aren't the one knocking your own payoffs down. This can be bad because none of the money you bet ends up supporting the game in a legit way. (0% of the amt you bet makes it back to the host track and 0% of your handle finds its way into the purse account.)
The house keeps the difference between the total amount bet by their customers and the total amount paid out to winning ticket holders.
Short tangent: Do an ALL button Data Window query to see that the avg long term loss for the player who doesn't know what he is doing is somewhere around minus 25% for WPS. (Link: Here.)
Operating a "book" in this manner has to be a VERY profitable business model... The "gotcha" is that it's illegal here in the US.
Those 10% rebates sound great on the surface but...
• If the house profiles you as a long term winner expect them to cut you off and close your account.
• Your account balance is always at risk. If the house goes belly up you have zero legal recourse when it comes to collecting your account balance.
• Like most "books" they have limits posted on their site. Poking around their site I found the following:
"C" tracks (Colonial, Evangeline, and Hawthorne are listed on their site as C tracks) are subject to the following limits:
300-1 all exotics.
In other words, hit a decent sized super or pick4 and expect to be paid $600 instead of say $4000.
If I may make an educated guess, the single most likely way a player gets burned here would be to hit a decent exotic at a minor track and then discover the "house limit" after the fact.
My advice (if you are asking for it) is be careful.
IMHO, if rebates on your handle are what you want there are better (100% parimutuel and 100% legal) options out there. (Contact me privately.)