As you said - in NV the Grand Bliss is central . It is also closer to La Plaza then any of the GL buildings.
This means a shorter walk to get Pain au Chocolate and the Frozen Yogurt !!
[well worth $ 600 ]
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Most Vidanta weeks in exchange companies are developer weeks.
IMO - Vidanta is charging a resort fee on exchanges to add revenue to their " hotel side operations" that would come from owner MF in other systems.
In 2005 Vidanta started selling MF on use only contracts. This means all weeks not booked by owners have no revenue unless filled thru other means.
Vidanta wants exchangers for their Vida Sales machine but exchange companies are (IMO) not a source of meaningful revenue ( unless you buy)
The resort fee (IMO) provides operating revenue to the "hotel side " .
Vidanta resort fees for RCI and II vary by location and unit size. They are the same across brands at a location. NV & RM have Grand Bliss
Nuevo Vallarta
$ 250- hotel room/ studio (locked off bedroom of a two bedroom)
$ 600-one bedroom
$ 950-two bedroom
Riviera Maya
$ 200- hotel room/studio (locked off bedroom of a two bedroom)
$ 450- one bedroom
$ 700 - two bedroom