Must do in app purchase to advance?

Cannot understand why there is the difference of spinner rod and regular rod. Just for the purpose of in app purchase of gold coins for rods and crashable spinners(should be called lures)? Has to purchase spinners which costs money! Has to purchase rods which uses the costly spinner! If exchange of silver coins to gold coins is not introduced, this game is a piece of junk. What a pity cannot give a zero star rating.

Mustdoinapppurchasetoadvance about Gone Fishing, v1.27