[tejtm]

>> Is there a way of guessing the likelihood of finding a planet?

> It seems that some stars are more likely to have planets than others.

to the best of my knowledge it has yet to be proved that any star has no planets.

[hajola]

Probably not the best choice of words from me there. However, there is a positive correlation between a star's metallicity and the number of planets a star has.

[tejtm]

Your words are fine from my point of view, I am just tickled at the though of how hard it is to prove a star has no planets. Even with all stars having planets, it is worthwhile to carefully choose the field to maximize the chance of detection. Best would be if planetary disks aligned themselves in any predictable manner, but not much hope there.