You can call it a cash grab all you want but you can be sure that this isn't the first offer they have received to perform over the year. You know what's an even bigger "cash grab" for Outkast? Releasing a new album, which -- based on rumors that have been released -- doesn't appear to be happening.
"I've seen so many one-year reunion stands over the last decade that had no point behind them other than temporarily excite nostalgic fans, but at the end"
So you don't like reunions because they excite fans for a brief period of time? You mean, like every other quality live show? Because you just described one of the primary reasons behind fans attending concerts: To be excited about music. Just because you don't like a specific artist doesn't mean they aren't headliner material. For example, I am not a fan of RHCP, but that doesn't mean they don't deserve a headlining spot at a music festival.