Depends how good and how well targeted your Facebook campaign is. I mean, if you have an incredibly niche product, and you target everyone on Facebook in that niche your click/conversion for more info will be much higher than a blanket Facebook campaign targeting everyone.
That said, I'd probably be happy with a .2-.3% CTR on most of my FB ads.
As to how well your lander will convert depends on how well you make it (and again, who you target).
As to whether something is worth making - I can't really help you there.