Woow, you are supporting some great authers and doing something really amazing for the community!
We (@sbcbot) are also trying to set up a community related to sports betting. We do find that we need to support the new coming authors who are interested into sports betting and because it is a very narrow nice, it is hard for them to get some support by other communities.
With setting up the community, we hope to decrease the burn rate of new accounts a little bit!
We do believe that communities are one of the corner stone for Steemit to become a real success. Communities like yours and ours towards a sewing community. The more people will feel at home on the Steem Blockchain, the more people will stay around and bring in new members!

We have set up our voting bot as follows:

• upvotes only whitelisted members
• max 1 upvote per day
• post will need to have the SBC tag (this way we can guarantee our members still can post about other niches or just real life)

We have set up for one vote per day because we don't want to encourage our members to post twice a day. When it is possible to get two upvotes a day, people will do it, to maximize their profits from the community, which will decrease the quality of the posts!

Our bot also does not control how many times a member uses the tag per day, we do trust them and the moment (after one month of running) we didn't see any abuse.
Because we know how hard it is to set up a community (not setting it up, but trying to achieve the ultimate goal : makings sure the members interact with each other and support each other and not the founders of the community), we want to thank you for the ongoing support you are giving to your members. Keep it going!

Ps: If you still have free spots available, feel free to ask for some recommendations!

Keep it going!
Cheers,
Peter