I could not have said this better JaZaHMum
Before I purchase a toy I think about what learning value the item has and for how long it will keep my child occupied. We have a good mix of toys that I rotate on a regular basis. I try to avoid too many commercial character type toys, although I haven't denied my daughter a Dora doll just because it is commercalised.
We don't buy toys unless the girls are having a birthday or it is Christmas. We don't have toys out on display either. All the toys are in the girls rooms and they seem to be more motivated to play with them if I bring out a box for the day rather than having them always in sight.
To answer the original question - I don't believe it is quanity that is the issue. If the item/s are being used and enjoyed then why not have them?

