LOL I am the same, i research all night sometimes, on the fish i have or on fish i want to get.
But i know this is true and anyone who denies it is lying. . .SOmetimes you go fish window shopping, you dont really go to all the LFS to buy anything specific, but just to have a look see. . .and then in one tank in the corner, they have this cichlid that some guy brought in and no-one knows anything about it, but its colours are amazing and you just have to grab this before anyone else does. In that case you buy the fish and do the research when you get home
Now that happend to me here in South Africa, only i never saw a cichlid in the corner tank, it was a fish with an elongated body, some stripes, large teeth and streamline body, when i saw it with my initial glimpse, i immediately knew it was what i thought it was. . .A SNAKEHEAD, in my LFS, i couldnt belive it!!! I knew the guys in the shop and said to them, do they know that they are not allowed to sell that fish or transport it. They spoke to their boss and in the end I got a great deal on both. . .

I was like probably the only guy in Cape Town to own snakeheads, a truly once in a lifetime experience!!! I was so stoked! The happiest guy ever.
My malawis killed both overnight. :-(((( Yep I know I know, I am now kinda famous among my fish friends for the idiot who killed two snakeheads.
Well in the end. . .I did my country a favour

))
Sorry about the way off topic story, but i get like that sometimes