None. Around 80% of my almost 400 models require an AMS.
When possible, I always provide a PAUSE option to allow those without an AMS to be able to print the item. By the nature of their design, it is usually not achievable as the colours are all in the same layers.
I work hard to minimise the waste material for my benefit and the users. I tweak the flushing volumes and the order in which the colours are laid down. Sometimes I provide a high and low-contrast set of profiles.
I imagine as you are known for single colour capable models when you introduce colour, that is a change.
My Willies collection models are all available in two or more colours with a single colour as a backup option. Most are printed in more than one colour. Someone who produces excellent designs of all sorts @Valeria_Momo produces a collection of Worms. I didn’t know her before I started adding multi-colour profiles of her Worms. The single-colour versions are significantly more popular than the multi-colour ones.
My takeaway from this is it comes from what you are known for. Valeria is another designer who makes compelling designs using coloured results that do not always require the AMS, although she makes many that do.
You clearly didn’t follow my rant. 
The P1S turned up around 10 days ago, and the second AMS unit turned up a couple of days later.
It was too easy to set up, even for a disabled bloke like me.
I like the smaller footprint of the P1S. There are still some things that print faster on the A1 and a tiny bit faster on the A1 mini vs the P1S.
The A series with AMS lite can print multi-colour items faster than the P1S. This has a lot to do with the travel path of the filament being shorter than with the P1S. With constant colour swapping, the travel length mounts up.