Why? Because it defines your business to others.
Okay, you may want that. if so, by all means promote lotteries on Facebook.
However, if you want to bring on a new supplier and they check your business out, be prepared for them to say no to you because you are a lottery shop. Yes, they judge you that way.
Also, the Facebook algorithm will restrict you sees your site based on lottery advertising.
If you have been doing it, is there any evidence that it boosts your sales? I have not seen any.
While I am not a lottery retailer, my opinion is it’s not worth promoting lotteries on Facebook.