Tom,
I thought I'd throw my two cents in here. I don't want to be a "debbie downer," but the first thing that springs to mind is that this is a very challenging business proposition. If you look at the pet industry as it stands right now, it appears to be following the model of many stores - mom and pop and speciality stores are disappearing, replaced by the megastores of the day. I'm assuming you're talking about a physical store here, but any time you have a physical location, your customers are necessarily going to be pulled largely from the immediately area. ("Location is everything.") That said, you're not going to be able to afford space in a high-traffic area, and that sort of store isn't going to attract much "walk-in traffic" anyway, I'd suspect.
Effectively, your store would be extremely attractive to herp experts. But I suspect it would be very difficult to get new herp owners, who are more likely to start at a PetSmart or a PetCo, and find everything they THINK they need before they learn more about their animals. And let's be frank, many many reptile owners buy pets without really understanding what's involved. Why would a kid who wants a beardie pay $75 to buy one from you, when he can get one from PetSmart for $35? WE know the answer, but I suspect that many of them won't, and you certainly can't out-advertise the megastores.
With a physical storefront, you'd also have high fixed costs, and in order to have any kind of inventory, you'd have very high variable costs in terms of food, veterinary care, etc. So, you're looking at very high costs, combined with a market that is essentially "all experienced reptiles in a 50-mile radius." My gut tells me that isn't going to be enough business to keep it afloat.
The more I think about it, the more I think you really need to go with a virtual store. Your costs would be far lower, and your reach would be far wider. In addition to avoiding the cost of a store, you could focus on building a community around your web site (such as with forums like bd.org has). Along with that, it would be far more practical to, say, set up part of your house as a "presentation area." You could invite people to come and visit by appointment if they want to see your operation. (Kind of like you do now, only if you're making it a business, make changes to your house to make a more presentable "mini store-front." Not that your house isn't presentable, but you know what I mean; separate the "living space" from the "work space".
Anyway, like I said, I don't mean to be a downer, but lacking any serious knowledge about the industry, it seems like a very difficult sell at first glance. That's just my two cents on the matter!
Steve