The level is seemingly high for routine use as a supplement, but it has not been proven too high. It is not too high for a once in a while boost to calcium.
A 100 ppm boost to calcium will boost bromide by about 1 ppm (about 2%). If that depletes as fast as the 100 ppm of calcium, then there is no problem. If not, then it may accumulate. I do not know how high it would need to accumulate to be a concern.