The places you mention are reputable as Antoine points out, but I would strongly advise against incentivised play.
All kinds of things can go wrong with that, apart from the fact that the programs may not like it or even strongly forbid it.
Everytime incentivised play come up as an issue, the webmaster is in deep doodoo.
The casinos have bonuses for that purpose, and sometimes you catch some free money for your players, like Wager Profits is offering at the time.
I know, it seems to make sense – I thought about it too when I started out. But believe me – more often than not it’s big trouble.
If they allow it and you do it, make sure you do NOT depend on your profit to make the payments to players. Players want their money NOW and casino programs pay LATER.