It's all related to who your market is. Near me are shellac fingers and toes for £10. She's not newly qualified but has been going for a while. I would guess she's pretty naive to think that will generate any long term clients. I charge £25 for shellac or gel 2 and we're busy (although nails aren't our only treatment).
I don't want clients that think fat acrylics that never come off are great. I want clients with disposable income who come and have their nails done and pay me my worth. They sit in a beautiful salon, they are treated to (mainly) intelligent conversation and a tea or coffee. We do have a slightly different approach as we don't offer extensions at all. We specialise in the natural nail, so we tend to get some who have had the fat acrylics on and suffered - and not all the horrendous nails I've seen have been NSS - many have been from salons locally that simply do crap nails.
A cheap set of nails is just that. Build a rep on great treatments - whatever they are - and keep attracting the right clients.
As I always say there is Aldi and there is Waitrose. Both sell meat, both sell veg and so on but I know where I prefer to shop x