Not sure there's a limit but bear in mind rule 1.6 (1.6)The Staff Team may ban any member from the servers and community at any time if they are considered disruptive to the community or we have a valid reason to believe they are here to cause issues.
The warning points as far as I know don't act as a 3 strikes and you're out. As long as you're not posting where you shouldn't be and aren't being stupid you should be fine
The warning points are basically just used for suspensions, unless they are given permanently. Some members have had > 8 of them, and still have access to the forums.
(1.6) The Staff Team may ban any member from the servers and community at any time if they are considered disruptive to the community or we have a valid reason to believe they are here to cause issues.