Because they are fancy! If you had the same conversation 2 years ago your friend would tell you to grow Girl Scout Cookies and Gorilla Glue #4 ( US strain ) , it was also the same thing when Soma came from Dr US in Barcelona with the Amnesia haze ( the true one ) or when I don't remember who get to USA to get some skunk and northern light seeds and create the 1st seedbank named The seedbank then Sensi seed bank , the haze was also US weed. The same happens for the chemdawg , the sour diesel , the new York diesel , the chronic from LA. European and US strain is a long story bro