Would you allow your preschooler to go for a sleepover?

No I do not allow my kids to sleep over at her/his friends' house, unless it's very close relatives. I do not want to make it a habit for my children to sleepover at people's house when they are young. I remember there was once my daugther went to neighbor's house for a few times during holiday and since then she kept begging want to go and threw tantrums.