[swarmee]

Here are my thoughts:
1) Cuban issue that's hard to get in the U.S. or even complete transactions for online due to the Cuban embargo. PayPal has freaked out in the past over vintage Cuban cards and locked people's accounts for months.
2) Cards are generally in poor condition, and were made by a company nobody really has a connection too. At least in the case of Topps Venezuelans, they're cards similar to the U.S. Topps issues that collectors grew up with. And they're kind of boring (black and white, drab pictures).
3) To me, their rarity works against them. People don't think the set is achievable, so people don't try to complete the sets because it's too difficult.
4) Not players they're familiar with.