For decades travel agents had a “lock” on vacations. Before the internet it was near impossible to find cheap fares yourself. And choosing the perfect hotel involved a lot of flicking through glossy brochures. The “do it yourself” approach was a huge hassle. It was a lot easier to hire a knowledgeable travel agent. Then disruptor stocks like Booking.com (BKNG) and Expedia (EXPE) blew up the …