For a plane that’s “not selling”... it seems to be selling rather well. The 747-800 has 90 sales, 44 options, 15 additional purchase rights.
The 747-8 passenger version has only 20 sales to Lufthansa, plus five in Boeing Business Jet configuration. The other 65 are 747-8F freighter versions, which were expected to sell well. The passenger market hasn't embraced the plane - it's apparently waiting to see where fuel costs go and how the 787 works out.
All I know is that when I go to SFO there are 777s everywhere - visually, it looks like the aircraft of choice for trans-Pacific travel.