Lots of food for thought on this thread. I was fortunate to be in Lourdes in 1958 for the centenary of the apparitions. I personally witnessed one "cure" but felt that the real miracle of Lourdes was the overwhelming sense of peace which pervades the whole town. In later years my brother in law who suffered MS and was not a catholic asked to go to Lourdes. He didn't go looking for a miracle, but he was a changed man on his return, in that his ability to come to terms with his condition and the effect on his family was truly amazing.
The truth about Lourdes is that it inspires hope and not just for the sick and disabled. This is the essence of the message given to Bernadette in the apparitions. I cite the example of the many years of prayer for the people of Russia said in every catholic church for many years - we now see a changing society there which attempts to be just and fair.
I also suggest that the sceptics look up the story of Jack Traynor, one of the more famous "miracles" I won't go into detail here but worth the effort.
Its great that such a subject can be discussed so openly on this site - that in itself is something of a miracle

Good luck