"We have sent you 5 cents worth of bitcoin: BTC0.00014435"
Presumably they will be newbies, so KISS.
You are quite right, I need to keep it simple and stupid.
But using whole BTC isn't an option because the payouts would appear too tiny.
"oh point oh oh oh" isn't something that people want to have.
So I had to find a bitcoin unit which is universally understood and small enough to avoid the decimal point, and I ended up using satoshi.
I disagree. Or at least: I'm not included in we.
My faucet is running since two weeks and payouts are quoted in satoshis.
I have received zero complaints, questions, or issues regarding the use of "satoshi".
I have a short explainer on my site which essentially says "100 million satoshis = 1 bitcoin". And that seems to do the trick.
Thus I have zero incentive to add any additional units to the system. I don't want to needlessly clutter up my website.
Actually, I'm rather worried that additional units could confuse newbies, for example, like this.