DoES - we're doublechecking all the time, the only difference is that via BOINC it's done almost simultanously. If you're really after reportables you might want to do PRPnet or offline crunching - you'll always be first to do a WU. Don't know about initial finder and double checker points though. If I understood correctly, the primes might not even be sent out again via BOINC. But I'd prefer one of the admins to answer this.
BTW - my RAC is much higher than my average daily work. The formula doesn't cope very well with big chunks of credits being granted as it happens when you participate in offline sieving.
There are only 10 kinds of people - those who understand binary and those who don't