No.  Heck no.  Even though it is indeed a great promotional tool - I would never ever ever ever bother a couple at the end of their wedding for a testimonial.  Selfish and tacky in my opinion.  Whenever I see this on social media - I cringe.  This isn’t a game show.  I want to end the night with a big ol' sweaty hug - not them giving an interview for my own business needs.