Ask yourself these questions:
1. Is there any mention anywhere on your sites about responsible gambling;
2. Do you plan on paying taxes on your business profits;
3. Have you (or do you plan to) donate any of your business profits to gambling related charities;
4. Do you state anywhere that you do not accept betting from underage players; and
5. If Satoshi were to comment on your business, would it be negative or positive?
It would have been nice if you asked in a more professional manner, but I'll respond to your questions.
1. No. Should a paint salesman provide instructions on how not to eat paint?
2. Yes
3. Have already donated a considerable amount to both charity and other btc project development, will donate more in the future.
4. Yes
5. I have a feeling Satoshi's opinion is favorable
The ability of a person to make a wager on a future event is not unethical. Many find it fun. The stigma attached to gambling is generally related to puritan religious nonsense, which posits that some activities are "vices" and are wrong. If you hold that opinion, don't hang out in the gambling sub-forum. Freedom of choice is a beautiful thing.