I just got out of a photo studio to get some pictures for my passport and I told the photographer "Do you have a ten, I am trying to collect as many ten." It sounded more natural to end with "ten" than with "as possible", but on second thought I don't think this is even correct in informal speech. What's your opinion on this?
No, that sentence is not grammatical. You should have said "Do you have a ten? I am trying to collect as many tens as possible." When you use the phrase "as X ..." you have to have something to compare it to, so it's "as X as Y".