Really depends on a certain company whether they would really be giving out that kind of amount as shown for appreciation on finding a bug, i do agree on what others been saying that there's no such thing about perfect security or perfect coded website on which there would really be errors that could possibly exist but its true that before they would really be making that main launch then everything is already set and pretty sure that
they had already polished it out when it comes to those bugs and fixes. Now on what op had been able to find out then it is really that indeed neither a serious or a small issue on which they wont really be
tending to give out any rewards not unless if its a major one but its true that they can fix it out silently without telling or giving out some response on the said report.

On which they would really be just simply ignore or deny that it wasnt an issue. For those gamblers who do really be able to report those bugs and exploits and expecting something for some reward
then it would be better that you shouldn't because not everytime they would really be giving out that kind of reward or bounty on the thing that you have found out.
Luck you if they would be reconsidering those things you had reported but we know that not all would really be having that consideration and just simply ignore you.