Is this LEGO set rare because it's promotional?

Yes, as a Promotional theme set from 2020, it holds specific collector appeal.

How many pieces are in the 6339339-1 set?

The LEGO Gift Box 6339339-1 includes 130 pieces.

This promotional set was released in the year 2020.

Name: LEGO Gift Box for Double Eleven (6339339-1)
Brand: LEGO

Promotional

Promotional · 2020

Theme · PromotionalPieces · 130Set Number · 6339339-1Year · 2020

Used

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New / Sealed

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Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is this LEGO set rare because it's promotional?: Yes, as a Promotional theme set from 2020, it holds specific collector appeal.
How many pieces are in the 6339339-1 set?: The LEGO Gift Box 6339339-1 includes 130 pieces.
What year was this LEGO set released?: This promotional set was released in the year 2020.