I've had two dogs at once before and it was a lot of work, time, money and energy. I loved both like crazy, but have realized that now that I only have one is the best situation for me and my family.
I know to each their own. My reasons for liking the "single life" is because its easy to travel with one, it's cheaper and I get all the snuggle time. If you have the means, time and want for more go for it. Yorkies are like potato chips you can't just have one