I'm really not understanding the premise, maybe years ago when toys were a new thing, demonstrations were rife.
We discovered by ourselves that taking DC food shopping would involve them seeing the toy aisle, so the compromise was, if you're good whilst shopping you get something.
We wouldn't think, we're in London, with amazing free museums, that will have free educational activities. Not to mention other activities being put on over the summer. I wonder what we could get for free in Harrods or Hamleys.
At one location we went to, we were offered something to try, the man said the sample is for both of you.
It seems really entitled to expect freebies, when realistically tattoo lady isn't wanting to show off her skills, she wants you to buy the product. By trying a product DC doesn't become a walking advertisement. She has received a kind gift from a woman who is likely panicking how her bills will be met.
I recognise the tattoo lady has a job, the more she sells, the more likely she can pay bills / rent / food. If I know we won't be buying then there's not much point in wasting the persons time, a child's expectations and our sanity having a sulking / crying child.
DC were taught as soon as they could comprehend, you earn treats, you don't get what you want because you want it. Sometimes Mum & Dad can't afford it, so even if we wanted to we can't. Strangely they've always comprehended this, never really asked for anything, unless we said here's £5 to get something with.
I knew a grown adult that I expect your children to grow up like. If there was anything free, anywhere, they would go mental and try and get as much as humanly possible, much to our horror. Even in Harrods at the fancy fruit & nut section, the sales person offered one sample, they pretty much sampled everything before walking off. Mortified doesn't cover how embarrassing it was. It was almost like they had a beacon for free stuff, in certain stores, the person watching over samples has the expectation adults have the common decency not to go oh God that's nice, I'm starving, picking up several more samples before walking off. Yuk!