~snip~

This is a very interesting story, thanks for sharing this,

NastyMining has recovered 6.51961 BTC as a result of our investment with user TradeFortress.

Well, at least, you are among the lucky ones, I guess...

Has there ever been a case of a Bitcointalk scammer going to jail?

Excepting the examples given by suchmoon, I'd also add the case of knightmb. The case was very well documented by xtraelv.

knightmb account looks like it got sold or hacked some time in 2016 / 17
Went from only English posts suddenly to only Turkish.
https://bitcointalk.org/index.php?action=profile;u=345
https://bitcointalk.org/index.php?action=profile;u=345;sa=showPosts

knightmb was number 7 richest bitcoin holder.
https://bitcointalk.org/index.php?topic=321265.0
At one stage owned 371,067.36 BTC
(Which is 3x more than Cameron and Tyler Winklevoss own combined)

Apparently, he went to jail for trying to extort a political figure

More info can be seen inside these posts of xtraelv: [1] and [2].