I agree, they might sell you the pack with a bms with a higher current so you can murder the battery though.
They can't make the cells c rate increase, so only by making the pack larger can they make it deliver more current and last.
The rule of thumb, is whatever they say the max discharge rate is, cut that in half. That more or less gets you into a discharge rate that has a chance of lasting for years. So in this case, call it 12-15 amps max.