The offer may not be bad as OP tried to discuss the consequences of the offer but still, it didn't give any guarantee that the hired players will get paid which could also be considered a scam.
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although it might happen(OP not paying) but unlikely to happen(but still not certain). OP is a representative of RounderCasino and if he did not pay the participants, the issue will reflect badly on their gambling site and will lose gamblers because of it. scamming $350(total payment for 35hours) is not worth scamming considering they will be losing thousands of dollars if they did scam the participants.
What's the exact goal here? Can we know the details? Back in the day, I used to play a lot of poker, can't manage to play such huge hours per week. Also, is it possible that you will compensate certain % if the player lose? Because, this may turn into a significant loss if someone loses at a streak which is very possible in poker.
I think the goal is to increase the number of gamblers playing poker on their poker game to attract more poker players(it dull playing poker with only 1 or 2 opponents.)