I used to collect nail polishes, thankfully I am out of the other side now. I used to have 300 plus at one point. I used to hunt down rare shades. I spent part of a trip to New York trying to find a particular limited edition Marc Jacob shade which was not available here. Sad cow. I tried high street polishes, the professional nail companies ones, and expensive designer ones. My verdict at the end of this madness. The best ones are OPI, Maybelline 7 Days (might be called Stay something now, limited shade range though) and Primark for a quid. The Primark are better than the Chanels, Diors, Nails Inc, Butter London etc.
I now have 10 polishes. They are all Primark and Maybelline. I have not polished fingers or toes for 18 months. I don’t miss it.