1/5 is a pretty good sucess rate actually.
About half the people who enter a challenge click that request a CC button. And there are about 50 people actively doing participating in the CC at any one week to cover it. Therefore, the ratio of people wanting is to people giving does not allow for everyone to get a CC crit every time.
The system might be changed soon - theres a thread on that around here somewhere, but in the mean time, if your want the chance of getting your image looked at by the CC, your best bet is to join the CC and help with the workload.
My guess on the other image is because someone has added it as a favourite it has appeared on the recent favourites page so more people have got to see it than pictures that have just gone straight into your portfolio.
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