I think it's more likely that Vayable just "grew at the same rate", where "rate" should really be "amount". 30% of 70 is 21 and April 2011 is about 86 weeks ag

I think it's more likely that Vayable just "grew at the same rate", where "rate" should really be "amount". 30% of 70 is 21 and April 2011 is about 86 weeks ago. 21*86 = 1806, so a rough projection of 1876 guides. The vayable website promises "2000+ tours", which with roughly that amount of guides with that projection actually makes sense :)