This would be the same as buying printers from a random person/people and as many as you can afford, until they logg off or you do.
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Even if you don't buy from people this would be the same as getting 1,2,3,10..etc from your friends and farming that way until you or they logg off for the night then ask the next friend. I don't see how it's a problem when it's filling the server and not causing issues with others.
EDIT* If it would be for server count, then the people who have ALTS should take a few of their ALTS off and let the server fill up with potential detonators in. There are already fake players on the serve when there are high numbers but I don't think there should be a limit. Especially if it keeps the server count up and as I said the people can always take some off so the public can join.
If you had 10 friends at 2 printers each go AFK all night/day then there is no difference from the two other then a single person owning the 10 accounts/friends.