thnx to Mouton's help on IRC I've "fixed" the problem by opening my eyes...
0 0 * * 1 (I'm used to *nix cronjob format) should be 0 0 * 0
also I found out that description of how the scheduler in ioFTPD works is not proper. It should be like this:
# Scheduler
#
# ioftpd cronjob format is x1 x2 x3 x4 where
# x1=minutes
# x2=hours
# x3=day of month
# x4=day of week
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