Everything that could be once only use was so, apart from water beakers and jugs. Item cost will have been in pence but grossed up, add in purchasing staff and supply chain and costs will mount.
It could be that this works out cheaper than paying people to collect all the different items, and then sterilise them to the required level.
I don't have the source handy, but I read that every dollar spent on the Apollo program resulted in a net benefit to the US economy of 7 dollars. It's not like the money disappears; it buys you skilled jobs, expertise, infrastructure, education, exportable technology etc, and keeps circulating round the economy; all those skilled workers are spending their increased earnings on goods, services etc, which pays more people's wages and so on. The question isn't whether or not you should spend the money, but whether you'll get even better returns by spending it on something else.