If you see it offered for sale, by all means buy some. Nothing is perfect, and orchids do get pests. If your house is too dry you might find spider mites infesting not only your orchids but other house plants, as well. Mealy bugs are always a potential threat to house plants. They usually come home from the garden center with you.
Scale insects are especially insidious.
All of these pests suck the life out of your plants, like wee vampires, feeding on the plant s juices. The easiest way to rid your home and plants of pests is to spray they with light-weight horticultural oil mixed with water. This stuff is non-poisonous and kills by smothering the bugs. Eco-oil and Sunoil are brand names you can look for. However you should not have any trouble finding a light oil in your garden center.