I was watching tv, and a guy was talking about outer space and said this sentence.
What does it mean when you say 'What I wouldn't give to...?'
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It's a less dramatic version of the doubtless hyperbolic
"I'd give my right arm [/hand] to be there."
(See, for example, Cambridge Dictionary)
The implication is that you'd give up many of your prized possessions / comforts in return for being there (etc).
"What [is there that] I wouldn't give [up] to be able to ...?" [implication: the list of what I wouldn't give up in exchange is small]
CED actually gives the expression:
what I wouldn't give for something (also what wouldn't I give for something)
used to say that you want something very much:
What I wouldn't give for a cold drink!