Hey! Thanks for playing our silly little fishing game! We're not allergic to math, but some of the choices were intentional to drive home that Simple Fisher Sam is scamming you. The game's silly, it's meant to be light hearted, and it's meant to be irreverent to the fishing minigames you find in a ton of games.
1. The cost of bait is relative to the most likely fish you can catch of the lowest Grade possible for the Bait, up to Huge Bait. Huge Bait has been lowered to 15. Kyle got cold feet on that and raised it to 20 but we think you're right, that the price should be lowered and we've updated it to reflect that change. The rest however -
For example, you are more likely to get a Fox Faced Fancy which is 9g rolling on the Medium Fish list, and then more likely to get a Zeta Fish which is 13, or Sam's Little Angle which is 10g.
The cost for Poor Quality is 4g so you can, just on the most average roll, buy two Bait per the most likely chance to catch Medium Fish. We made the game assuming you'd be using the bait to catch the highest level fish you could, but we still wanted to leave the choice for people on the off chance you get a trophy of a lower grade Fish.
2. If you're using the Gold Tackle on anything lower than Huge then you're not making an optimal choice which was intentional, honestly. The money choices for the higher stuff was made with the intent that if you can afford it, you're catching larger fish and not bothering with the smaller fish.
You get 5 uses out of the Gold Bait which guarantee a Trophy catch. The lowest Trophy cost of a Huge Fish only requires 2 to break even at the most likely of roll and everything beyond that you're likely to break even on a single roll. You get three or four more uses after that. So if you use the Gold Tackle on a Huge Fish, you're never wasting money. You can't ever not break even if you only use the Gold Tackle on Huge Fish.
3. Catching a God Fish is a special little thing, it's not the end goal. It's why you can't purchase the bait. It's not really designed to make a profit or really what you're aiming at. Huge Fish and Oddities are where we expected people to level out at.
I hope that helps.
- Kyle