Photo4Me just announced they'll no longer accept anything but 1:1.5 aspect ratio - and will be deleting any previously updated photos not in that ratio. I do a variety of aspect ratios, especially square, so I'm out.
I never sold anything there, and there's no way to see if you're even getting traffic. So, time to close the account.
Now the good part: when I asked them how to close my account, they said they don't have a way. You have to manually delete all your photos, one by one, and then erase all the personal information in your profile.