Well, it was not cheap although I was lucky with finding treasure ability. Treasure ability was found as 2nd 2 times, as 3th 3 times, as 4th 5 times and only once as 6th.
Still it costed about 40 astral stones. I am sure I had few for free or some reward. Now I am already finding them in treasures - lets say 10-12 total. I think about 20-25 I bought what was 200-250 AS.
Next part is "speed up" traveling which was used probably also about 25 times. Lets say another 250 AS. Total up to 500AS.
I was expecting it will be worth because seriously higher number of found treasures - now with number of treasures "probably" limited from one hunt to 1 - it seems that it was not clever move
.