What he's trying to say is that you are a brand new user coming here with a low post count and trying to sell things.
There are LOTS and LOTS of laser scammers out there. You have to be careful when buying things.
Are you a scammer? No idea, but it never hurts to be safe.
A middle man is where you send your laser off to a trusted third party to hold on to, a trusted person on these forums. Once the laser is received and verified by the middle man, the original buyer can send you the money and the middle man sends off the laser to the buyer. That way, the buyer can always be sure they are getting the real deal.
What 'big laser factory' do you work in? Why don't you just link us to your company, rather than selling them straight off? Or even a distributer of your companies products?
(Sorry about the harsh post, but I've seen lots of people scammed before, and it's always a good thing to be careful)