Is this a "shop" or "charity"?
As far as I know I'm the customer and as the customer I decide what I want to do and/or buy.
May be I'm just wandering around ... looking at nice bikes
May be one day that'll inspire me to buy one ... who knows?
If LBS's aren't able to keep up with the market than that is their problem, not mine.
It mostly boils down to basic assertivity.
I simply can not stand typical overwhelming salesmen and so whenever they come up to me and start their typical salestalk I immediately reply with:
"Thank you but I currently don't need any help ... I'll let you know a soon as I do".
Try it ... it works