I just declined a request because I simply had a gut feeling that something wasn't right. The request started off with info on a sick child and asked for help. Verifications only included email, phone number and facebook friend count. Was this a wise decision?
I think you should trust your gut. I had a funny feeling about a reservation yesterday. Should have listened to myself. After a lot of back and forth messages, she cancelled and requested a full refund. I could have saved myself some time and trouble.
Don't feel bad. Your gut is always right. If something bothers me about an inquiry or booking request I immediately hit the "decline" button and don't waste my time. Don't regret the money you "may" have made. In my three years of hosting I have never had any regrets about any declines I made, and there have been quite a few!
Oftentimes these where they are asking for help are actually a scam. You should hit the flag icon in the message stream to alert Airbnb to investigate further. Your gut feeling was correct.