What are your thoughts when you first walk into a store. Would you prefer someone who works there to come up to you right away and greet you and ask if you need assistance, or would you rather browse yourself and ask for assistance when you need it?
I've had both scenarios where I went to a store to look for shoes and nobody greeted me or asked if I needed help looking for a size when I needed help, to someone constantly asking if I need help while I'm browsing every few minutes.