This is a consequence of the required resources for the experiments. If it takes a ten billion dollar piece of equipment to produce your results then chances are you are going to be one little cog in a very big machine. There are not papers with 500 co-authors in any other field or even in sub-fields of particle physics that do not require massive accelerators to achieve results.

There are many large-scale projects in biology that benefit from open collaboration. In general, these require lots of work and produce useful resources used by a whole field. Insights that could revolutionize a field can sometimes be described in a sentence or two, and reproduced in a few days or weeks, so scientists are more uneasy sharing them.