Keep telling yourself that. You have been spouting that same line of reasoning all the way up to the $150's. At times like these, with boatloads of cash sitting on the books of many companies, that reason goes out the door and P/E, P/S etc. are ignored. I could still envision a company like Google scooping up the combined Z/TRLA.
Google will never ever buy Z/Trla ..... You are mistaken to think that Z/Trla are tech stocks. Google could build much better free service in 3 months to kill Z/TRLA. Google will most probably buy Yelp.