No. I would love to get them done like the ones in the picture, but running after little kids they'd never stay nice for long enough to be worth the effort. I file them myself and keep them natural for now.
I had them done once for my wedding. Though they look nice, I would rather spend the money elsewhere. That, and I'm afraid of infection. Besides, they aren't very practical.
Yes, about every six weeks. The nail polish lasts for weeks if you have a manicure, whereas it might only last for days if you do it yourself. Worth every penny. My little bit of pampering.