But in keeping with Jason Cohen's post, http://blog.asmartbear.com/customer-validation.html , "When ten people say they'll give you money if you build this thing, that's the only validation that counts."
So: would you ever pay $1-$2 a month for search, or is Google et al cutting it just fine for you?
(my first HN post, hoping I'm not breaking any rules I'm not aware of here)