Wow, look we got a thinking person on this topic! (I mean this in a positive way)
If the amount of Safecoin was supposed to scale proportionally to the number of MBs available on the network, Safecoin (and MAID, which will convert to Safecoin 1:1) would act as the “store of MB value”. If the number of Safecoins grows faster than the amount of resources coming online measured by usable capacity, then it’d still be a store of value, but inflationary - similar to the US dollar, which on average can buy less and less.
And then there are some exceptions - situations in which the purchasing power of your Safecoin may may need to be managed. Members who understand this problematic are considering edge cases in which the use of your coins may need to be discouraged, as they call it, because in rare moments there may be too few resources available for sale for your Safecoin.