WGT knows of the invite issue. 1,000 separate posts, and all of the comments in those posts will NOT get them fixed. It's clearly obvious WGT has the mods muted on the subject. It's also obvious that if there is going to be a fix, it will happen on the next downtime. If it doesn't happen, it will probably not ever be fixed or addressed.
The revenue from multi-player games is the lowest of all segments for this company. I can promise you, it is at the bottom of the "to-do list". Constantly filling the forums and every thread concerning invites borders on insanity.