What if I want to buy something that costs 1000 points, which equates to $10, and I have 300 points in-game? I want to use those 300 points, but I want to cover the rest with $7 of real money. If they only list two costs - $10 or 1000 points - I can’t do that, but if they let me buy 700 points for $7, I can do it.

It’s only really a problem when you can’t buy the exact amount of points you need to make a purchase (which granted is most of the time). There’s legitimate reasons for using a “points” middle-man, though - for example, in a game where you can earn premium currency while playing, but also buy it; if you were making purchases directly, rather than buying the points you need, you wouldn’t be able to buy something using both earned and purchased currency; it’d be all or nothing.

This is definitely a very small minority, though, and 99 times out of 100, I agree with you, it’s a scam.

Sounds like (purely speculation, since the details aren’t available) he pulled a gun on or otherwise threatened the agents coming to arrest him, based on his other behavior. Told them to come back with a warrant, they did so, and he took issue?

Either way, posting on the internet about assassinating government officials, regardless of whether it’s serious or not, was probably not the smartest opening move.