niecie, if you are talking about below-2s, the staff-to-child ratio dictated by Ofsted (I believe for nurseries and CMs) is 1-3. So to have 10 carers, you are talking about a nursery with 30 babies in one room, which is A LOT of babies. My experience is that baby rooms tend to be quite small - and I have visited a few nurseries.
My dcs' nursery operates a key carer policy, where one member of staff is primarily responsible for a child. This person is a vital part of the settling in process. The child forms the bond with the key carer, but as he/she gets more familiar with the nursery, invariably forms bonds with other carers as well.
I don't have a problem with many carers. In fact, the more the merrier. More staff is drafted in at mealtimes because many of the little ones need help feeding.
This one-to-one business is a red herring. In a busy household with more than one child, each child does not get one-to-one attention from the SAHP anyway, as I have explained below.
In a pre-nuclear family days, children tended to live in extended households with many relatives and carers to turn to. In this slightly chaotic environment, the person nearest to the child picks it up if it starts to cry. And if that person cannot soothe, another takes over. That's what happens at nursery. Children can and do thrive with this kind of care. It is great for them to know that the world is a kind and cuddly place with many loving hands. And they still know who their mothers and fathers are.