On another note; finding a manufacturer that does not allow sales over the internet is probably a great find.
I like the way you think :).
Back 10 years or so ago I had to source a textbook title that I sold online. The sole distributor in my country refused to sell to online only bookstores. And laws in my country prohibit purchase of books from other countries where there are distributors in the country (you can't make this stuff up. Protecting culture or some such nonsense).
Frankly, these people are idiots. Justify it however you want, if someone wants to buy your product and you're not selling then that's just nonsense.