Yes, ofc!!
Some foss projects have that model, eg FairEmail iirc (and yes, I "bought" it). Similarly others offer unessential perks for "the paid version". (And others still offer support, sort of like a SLA.)
But "paid version" it's a bit of legacy proprietary thinking, I'm happy if it works, but just have the mindset to donate anything to the projects you use/enjoy (even better, have a monthly donations set up, big dev projects really need that cf predictability).
What I will not do is willingly pay for property software (outside of games and similar stuff). Idk even what I bought last, but maybe like 2 or 3 proprietary programs in my whole life (W95, some Android app to code my car via obd, ... I guess by cars had/have a bunch of closed sauce sw I technically paid for).