Let's see, if you invested 1000,- on jan 1 2017 (BTC against Gulden):
BTC buy @ 948, now 6,117 -> Profit 5,169
NLG buy @ 0,03 (33,333NLG), now (33,333NLG @0,07) 2,333 -> Profit 1,333
So BTC did 4x better than Gulden.
And you can easily get that profit without worrying about crashing the order book. Taking 1K+ profit on NLG currently will drop the rate by half a cent