Is it worthwhile to spend 20,000 Delta miles to upgrade to Delta Plus?
The covid-19 variant?
Jk, you probably mean Comfort Plus, if you kept those miles, at the right time of the year, those miles could be a one way ticket from NY to Hawaii, or roundtrip NY to Miami etc.
If I had a choice to spend $200 instead of 20k miles, I would use cash instead.