I just about always have nails on unless they have to be removed for a course.
Although i have to tip or sculpt as i find the enhancement, as long as they are filed properly, won't scratch my clients but if my natural nail has grown up over time, i have to take them off and start again. I always have quite funky/different nails with glitters or if i have natural enhancements bright enamels as i find its a great talking point for business plus i think having varied nails eg natural, glitter smiles or custom blended shows a range of skills to your clients as I find it difficult to photograph nails well...
... anyway back to the point ... i feel like im out with no knickers on if i dont have my enhancements!!