I agree. Only context can make it clear.
We should stay more than three more days with that card. If we don't, it won't be worth it. It is as if it is a "ten-day card" (ten or any figure greater than 3) and one is saying that it is too expensive to be used for a three-day stay. It is as if the card could be used for other things and we have a choice.
Don't stay three more days with that card. That'll come out too expensive.
As for the 'too dull to/for', I would say:
- This knife is too dull to cut meat.
- This knife is too sharp for a 4-year-old.
I reckon you can say "too dull for cutting meat", but I still prefer "too dull to", though "It's made for cutting meat" is fine.
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