If you already have trust, and want encryption. (Score 1)

SSL is for two things: 1. Encrypting the data going back and forth between user and sever. 2. Proving that the server is who they say they are. #2 is inherently flawed, and really gives you nothing anyhow, as hundreds of comments before mine have pointed out. #1 is useful, and the lack of a lock icon doesn't change a thing. If you already trust the domain, then go ahead and accept the cert. I use SSL on servers that I run all the time, and don't bother to get a CA to sign the certs, since I trust myself to be who I say I am :) Just don't enter your bank info or email credentials unless you really really trust them!