I've never had the pleasure of visiting one. I should imagine that they were far more popular when the internet was still in it's infancy. I remember when things in the computing world moved at a far more sedate pace. The cpu, graphics card, memory etc; were still relevant for a good while before they were superseded.
Nowadays we have a new generation every year. The new generation cpu won't fit in your existing motherboard so all of a sudden a decent upgrade has now virtually become a whole new system.
After a long wait for my graphics card I have managed to get 20 months out of my latest setup but am starting to get the itch to upgrade again.