I've learned that it's great fun to meet fellow-bloggers. We share many interests and find chatting easy and enjoyable. That is a cogent reason to visit online-friends in person.
A second reason I do this is my age. When you get to my stage of life, you realize nothing should be taken for granted. We see friends and family members get ill and die; we discover there's a finite time left for us. Life is a precious gift that should be savored. Don't postpone having fun until tomorrow; you might not be around then.
Famous comedian George Burns commented on this point. At his 90th birthday party, George said he doesn't put anything off. His exact words were "At my age, I don't buy green bananas..."