First, you would have to anticipate getting information which is not available from sensors based somewhere in this solar system.

Or, assuming that it would take 100+ years to get information back from the probe, how do you know that technology 20 or 50 years after launch wouldn't make solar system based sensors able to give you similar information, making the probe largely useless?

Second, you'd have to spend current funds for a return on investment which is a hundred years away.

Third, that "return" isn't guaranteed.

I doubt "they" will ever do it. Hope not, in a way. I think Man would be best off laying low, and staying out of sight. No on seems to treat things other than themselves very well, and Man doesn't even treat Man great.

Arf