Here's my take on it. The only way to limit sales would be to have code written in the ordering program to not allow more than say 3 knives of any one type ordered at one time. So if you wanted to order 12 knives of one type, you would have to go through the process 4 times. This would give others enough time to get in and place their orders as well.

So if you have the Scraper 4 come out and the scraper4 LE lets say. They could only order 3 of each at one time. Then they would have to go back in to place a second order if they wanted more, thus, allowing more time to others to get in and order their knives.

I picked 3 as just a number, but it could be 2 or it could be 5. I said three because that sounds fair enough.

Thus, you are not really placing a limmit on how many knives someone can buy, your just slowing them down so that others can get in on the frey as well.