You would expect this from the two most innovative companies in the industry. Both companies are leveraging their revenue to grow rapidly. A concern for profits at this point is premature. Trulia was profitable years ago at a vastly smaller revenue number.

profit isnt the only concern; the revenue numbers dont seem in-line with companies that have such high valuations.

Hmmm... Combined market cap is about $10bn, which is about 25x revenues. The similar ratio for Google is 12x. Dropbox's revenue is reported at $200m with a $10bn valuation, which is 50x. So the ratio doesn't seem crazy to me given the assumption of growth potential and the ability of the new company to better control pricing. When you say the numbers don't seem in line, what examples were you thinking of?