One advice is, I think instead of posting a new tip as a comment, better to update the op with your new tip, while you shift the old tip to the comment, so that users coming into the thread can easily have access to the new and latest tip right there on the op, much better than them having to search through the comments section to find your latest tip.
How do I do this ?
I can update the OP but how to shift the old OP to comment, I have no clue.
You can just edit the OP and add the new tip for the day and put the date. People will be able to see the date and know what day you are betting.
Good luck on your predictions.