I've gone in for selling stuff to acquaintances and co-workers. My advice is don't. Unless you want mixing to be your job, don't because if you're any good they will try to turn it into one -- and that's fine with strangers, a bitch when it's people you see every day.
Nowhere near the worst ended relationship I've ever had, sadly, but there was one involving my writing that got pretty damn bad before I just said "fuck you" and walked away. None of the times friends or family have asked me to work on their computers have gone at all well. etc.
Also selling stuff to friends is like the inverse of loaning them money. It's just bad. Like, I've given friends money, but I also said something like "look, if you can pay me back fine, but just take this." I gave out exactly 1 straight-up loan, never got paid back, never bothered to argue about it, I just stopped talking to that person.
I would give people small bottles of my new flavours to see what they think, but yeah, no way I'd go in for selling unless I wanted to make a job of it.
Oh, worth noting -- if someone I knew was good at mixing and gave me new flavours from time to time, I'd give them like 20 bucks every few times they did it, and make a point of not really talking about it And I'd accept the money if I was giving someone stuff and they just handed me a little money. If they talked about it tho I'd refuse.