I was never very good at demanding more than I deserve, and apparently, that goes for pixelated people as well.

How do you guys figure out how much you can overcharge? Any tips for a quick calculation? I have reserched lv.2 marketing, have the golden seahorse, the diver guy, the shell, and the tower thing, yet I can never seem to get more than $10 over the original price. Is a it percentage based system (like you can overcharge more on pricier things) or is there a set margin of what customers will over-pay?

Any advice would be much appreciated, as this game has enveloped every last one of my free moments, and I wish to master its awesomeness.

I'm sure you were looking for a more precise answer, but it's mostly just trial and error. As the game instructions say, "If your fish are selling really fast, you may be pricing them too low. If nobody is buying, they may be priced too high." So, price 'em high, and if they don't sell, adjust the price downward. Otherwise, you might be losing out on profits if you price them low and they go "flying off the shelves" (so to speak)!

You can get some indication of what the customers are thinking by paying attention to their thought bubbles (the ones that contain red or green dollar signs). In the end, only you can decide if they're selling too slowly or too quickly!