Tough business given all of the competition that you will be facing. Just look at all the knife sites online.
There's a "brick & mortar" knife only store not far from me but, after visiting the store a couple of times and buying 1 knife (a balisong) at full retail, I haven't been there since, except to send a Benchmade auto in for a "spa treatment" because Benchmade will only receive/send the knives they work on from/to a dealer.
Frankly, I don't even know if they're still in business because I haven't been there since before the start of the pandemic a couple of yrs ago.
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I'm no expert but I did own a brick/motar storefront business for awhile and the fixed monthly expenses (rent, utilities and insurance) will eat you up unless you have the monthly cash flow from sales (or a deep pocketbook) to carry them.
And this doesn't include the renovation/equipment/furnishing costs to open/maintain the store premises, permit/licensing fees (if any), advertising, inventory, supplies, tax and accounting services, legal fees associated w/formation of the business (eg., LLC), banking/credit card payment and financial services as well as other business expenses. And that doesn't include salaries (plus Workman's Comp, Social Security and employee related payments) that you'd have to pay if you eventually have any employees.
So, why anyone would contemplate opening a "brick & mortar" store in this day and age is beyond me but, if you think that you can really make a go of it, just make sure you have a lot of cash on hand because (as the SBA will tell you) most businesses fail because they are undercapitalized.
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Actually, the best advice that I can suggest is that you contact the SBA to speak with a member of their SCORE Business Mentoring Program. You can find more informtion about this program
HERE.
A SCORE Mentor should be able to provide you with a realistic assessment of your chances for success (or failure). Good luck!