I have read through everything there, I think, and it looks like there is no restriction on limits OR number of hands played at the 2 tables simultaneously?
So, this is an easy $50 for playing just a few hands of micro-stakes each day if you choose to. Make sure you jump on that Invig, there's your boost to your 1c/2c challenge!
Maybe I am missing something?
edit: I guess the offer of double points is worth more to players with volume on higher stakes than the $50 is to micro-stakes players, maybe.