Notice, I didn't use the word 'invest'; but 'speculate'.
Some want to ride the roller coaster, some want to watch, some avert their eyes...
Every word I posted is important, especially the words after "unless".
I invite everyone to view a 5 year weekly chart of TVIX - stockcharts.com or wherever. TVIX has reverse split many times. On March 2, 2015 the split-adjusted opening price was about 520,000. It has massive decay built into it's structure and should be thoroughly understood before speculating or "investing".
Thank you again for the great post.