Bill,
I do the same thing. If they are not savvy enough to include their name and contact info in the ad, why should we think that they are savvy enough to complete the transaction without problems.
Another pet peeve of mine, although one we all have to live with, is receiving email inquiries about animals that are unsigned.
How many times do we receive emails like this?
That's it - nothing more!
Although I am very patient and work easily with people either new to the internet or new to reptiles, I still feel that there should be some level of professionalism, or at least courtesy, when making an inquiry.
My initial thought is that I question their ability to:
1. Complete the transaction
2. Properly care for the animal
Of course, in many cases with an initial contact like that, you never hear back again after your response anyway - so I guess it's moot.