I bought points when Sunterra first started the Club and converted many of my units to points. I was just going through some of the deeds and paper work and it doesn't say anything about not renting out units.
Here's what it says in the Disclosure Guide for the Club from 2015:
2.5 Member Rentals.
2.5.1 A Member is not prohibited from periodically renting the
Accommodation reserved for the Use Period or the reserved Other
Redemption Opportunity pursuant to these Club Rules. However,
the use of Points to reserve Accommodations or Other Redemption
Opportunities for commercial purposes or for any other purpose
other than the personal use of the Member or the Member’s family
and guests is prohibited. Use by a Member of public advertising or an
online website to seek renters shall be deemed a prohibited commercial
use. Members who are primary developers of Club Resorts (that is,
members of the Diamond Resorts International group of companies)
and providers of Other Redemption Opportunities are specifically
exempted from this restriction, and are entitled to use their reserved
Accommodations and reserved Other Redemption Opportunities for
promotional, rental, or other commercial purposes.