Wortgames
'Draught' is not a beer style - it's a lifestyle
That's a bit unfair - it's more like you saying 'to hire me as the barman for your event will cost x dollars, regardless of how many beers I pour'.
If each beer had to include the entire hire cost of say, the portable bar setup and staff, then each beer would have to cost hundreds of dollars - in case a client just bought one beer by itself on the night. It's much more reasonable to list the fixed costs separately from the consumption costs.
A separate, fixed order handling fee is perfectly reasonable for an online business - it is basically saying 'look, this is what it costs in time and materials to package up an order for you, so buy a few bits and make it worthwhile for both of us'.
It takes about the same amount of work (and materials) to send one little item as it does to send 50. Whether that works out to be reasonable depends on the size of your order, and I think that's fair. I know I wouldn't want to sit there all day putting single o-rings into envelopes, along with receipts and labels, for 2c profit a time. I also wouldn't want to pay 70c each for 20c O-rings.
