Is such a smart way to go for LL, imo. A robust middle class spreads more money around than a small population of wealthy people. I'm sure LL will continue to make it worthwhile for estates, but bringing in more people who think a membership and a Linden home is a good deal means more stipends spent on content creators of all sorts and more people traveling around Second Life and telling their non SL friends to come check it out. Multiplier effects on the economy is going to be pronounced.
At the annual rate, premium is basically free. Pay US$72, get L$1000 one-time-bonus plus L$300 x 52 weeks; L$16600 total.
At this second, it would cost US$67.63 to buy that many L$. So, the net price of Premium is US$72 - US$67.63 = US$4.37 per year.
At this second, that US$4.37 would buy you L$722, and for that you get a 1024 square meter lot and Linden-home plus 351 prims for 52 weeks.
L$722 divided by 52 weeks is less than L$14 a week for rent, and works out to L$0.0396 p