Ok, lets forget about Rijk and his personality for a while and stick to hard facts here then:
The question by the op on June 2 2016 was: "Is Gulden a good investment?"
1 BTC on June 2 2016 was worth $ 535.00, now it's worth $ 9,670. A profit of 1800%
That same BTC would have bought you 256,426 NLG (@389 sat) on that same date,
Which at current rate of 1,000 sat would give you back 2.57 BTC. A profit of 257%
Answer?: NO, if you kept your BTC you would have 7 x as much profit!
Ha haa You can't calculate, You shows that Gulden is 2,57 times more worth than that single bitcoin you started with

So the Gulden profit in that period is about 4700%
On june 2 2016 the Guldenprice was 0,0017
And Now it is 0,08. So a factor 47 higher