The claiming system have nothing to do with difficulty; it's just a scarcity system. If content is truly difficult, then what matters how often can you try? Limiting number of tries (either by timers - which I should point out I'm in favour of - or by competing - which I'm not in favour of- ) is marely a ploy to make content appear difficult by making it scarce.

As was pointed previously, let everyone try and the results speak for themselves instead of going for Luck'n'Lag gameplay where those 2 qualities decide who is 'pro' and who is 'casual (in the mind of 'pro' equal to nab)'.