Fisharoo,
Why don't you just ask the question you want to ask? Here... I'll do it for you:
"Will anyone would pay me a subscription fee of $50.00/year to use an online fishing log? If there are enough people interested, I will develop and host the application. The idea would be that you use the application to record your fishing trips and then all the data is aggregated and shared with other users. The application could also produce some basic analytics depending on what data was captured."
I mean really... we're a pretty open group of guys, so you could just ask what you want to know instead of "fishing" for this information.
I keep a fishing log in MS Onenote. It is available across all my devices (Windows Phone, iPad, laptop, and on the web), and it's easy to search, paste in tide tables, pictures, etc. Would I mind sharing the data? Not at all. Would I pay to see someone else's data? Not at all.