I started years ago and now have nearly 30 of them - it can become addictive.... First I went for some bright colors to match dress style and cars. Later on I discovered the range of MRG G-Shock which are incredible for gardening and other heavy duties. And now I am collecting highly limited editions which show up in figures of about 5 for whole Europe (the rest stays in Asia within a huge collectors community) - thanks to a good collectors relationship with Casio HQ they offer me each new limited version directly
(with one exception - I did not get an allocation for the basic G-Shock made of pure gold).