Yes, hence this thread. Since void's are harder to get, it also doesn't make sense for the mercy system to be the same - argument is that the summoning is the same. Yes, which leads to the next question - why is the summoning the same? Void shards are 5x more expensive than the ancient shards - the summoning should reflect that.
This would make sense if Plarium wanted lower sales of Void shards, and I would love better summoning rates too but I am guessing this is counter to the current business model... or any potential business model.