I never turn down an opportunity to show prospective buyers houses, whether I am the listing agent or not. I build long term relationship with my clients and I don't expect them to buy NOW!
As a listing agent, I have an even great incentive to show prospective buyers the house whether they might be in the market NOW or now - for all the reasons just like you mentioned above. The neighbors are always the best ones to help sell the house.
Price of the house has nothing to do with whether I will show a house or not - I should not be taking the listing if I have problem with the price.
BTW, congratulations on the purchase. I remember when you were first on Trulia - haven't seen you for a long time and wonder what happened to you.
Glad to see the familiar teddy bear :-)
that way, if / when you DO decide to buy or sell, I will probably be your Realtor of choice, because we've built a relationship.