Summary
For some, vacation means going to Hawaii, Orlando, Las Vegas and repeat. Nothing wrong with it, this vacation paradigm makes HGVC to HHonors conversion very poor value (and not needed).
In addition to usual HGVC hotspots mentioned above, other travelers like to explore Italy, London, Greece, Park City etc. Doing HGVC to HHonors conversion makes all the sense to this group.
Enjoy your vacations whether at HGVC hotspots or at exotic locations staying at Hilton Hotels!