Just saw these 1990s sets in a local shop.
Would any of these be a good investment?
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Most of these sets will have very little potential value. In regards to the parts, most of these parts are constantly being produced and very easily available. There might be some exceptions for Duplo pieces which I am less familiar with.
The modern day 2021 equivalent of these sets would be the 'Classic' range of sets which tend to include the same parts but with more variety of colours and shape.
Despite supply of these sets on Bricklink being fairly low, they are also low demand and as such the prices are more or less below retail value (usually less for used sets). As an investment it would be important to consider how the costs of packaging, postage, seller fees (Ebay, Paypal etc.) could eat into your profits.
There may also be interest for these sets purely for nostalgic reasons.
I personally remember owning the red LEGO basic buckets and I recall it being nearly indestructible. In contrast to the parts themselves, I could actually see more potential for those containers to be valuable in the future as they provide novelty and storage value.
The condition of the 'bucket' sets also seems to be a lot better than the cardboard boxes and they will most likely last longer. There is some warping on the packaging where the stickers adhere to the boxes and potentially there could be some UV damage from being in a shop window for a long period of time.