The guy with 8 Vertex4 SSD (256GB X8=4TB) uses that 4TB SSD drive RAID0 array as his OS drive for extreme speed and loading times of games. He actually has the thing nearly full (3TB worth) of games installed and is a big gamer. It's backed up nightly on his server so reliability of RAID0 is not a concern at all, and he uses it enough to want SSD performance while loading various video games and they just don't make any high quality 4TB SSD drives for sale.
Sure it's expensive- but his system is in a Cosmos II case ($349) on a i7 LGA2011 CPU ($999) with a $599 motherboard- so it's not that crazy considering he's got the budget and is a large enough enthusiast to see value and real world benefit.
But 22 SSD becomes a different story. There is no practical real world reason to do what is in the picture above. Anything beyond 8 makes no sense.