The maximum number of warning points you can get is infinite... Even if it doesn't rally matter after thirty.
Okay, not really, but it has a lot of 9's. Most of the time, we will give 0 to 5 points for a minor offense. This serves merely as a formality. Like a parking ticket. If you're being rather frisky and combative, or are a repeat offender, we hand out 10s. 10 means we are trying to make a point.
If we think you haven't done enough to be banned, but need a really stern warning, we'll give you enough to bring you up to 29 points. Realistically, there's no difference between 20, 25 and 29... but 29 is more obviously last chance. On the bright side, this means we don't want to ban you. On the other hand, it means we will if we have to.
If you're a total arse, however, you can get a straight 30 point infraction. And if you're beyond that, 35. I've given a few of those. I think the record is around 100 points. If I recall right, every one of those points was deserved.