IIRC the supporter bonus was given immediately, adding 30 days to the current available vacation time. At least, that’s how it worked at the old site. Now it seems one only gets the opportunity to accumulate more than 4 weeks, without receiving immediate bonus time.
Is that a bug?
The way it works now is by computing the time difference from the last time you took vacation… so it’ll give you an accelerated jump, up to 30 days, but it’s not a fixed amount of time that’s added. Honestly that all is simply an artifact of the way the vacation calculator ended up working, not a purposeful policy.