Should writers invest in going?
I don't really have any knowledge to help you with this. I think it depends on if you are self published or traditionally. It may be a great way to get yourself and your book out there, but I am not familiar with the cost of it to be a part of it, plus your travel expenses. I think it also depends on your budget.
Sorry I am not of that much help on this one.
Thanks for the quick response! :)