Obviously never been a one-man show small business owner !!!
Having "been there and done that" I'll tell you that I just wouldn't be interested in your business. For one, people tend to rattle on about ****, then they want opinions ... "what do you think of this, what do you think of that", then there's the question of price and "can you do any better - I can get here here for this much". And then they call you back four more times 'cause there buddy who's more of an expert said this or that. And in the end you never hear from four out five of those time wasters and the one you do sell to has chewed up all your profit over the phone.
I've dealt with Dr Diff on several occasions - all by email. Always got fast replies. Always got all my questions answered. Not all resulted in purchases but a few did and were seamless - and we never once spoke person to person.