Okay, let me break it down for all the people who think MCT’s/MPTC’s are worthless.
Individual Omega accounts are best if you need to login multiple characters at once, you plan to train the characters indefinitely, and you plan on paying cash for a subscription.
MCT’s/MPTC’s are useful if you don’t need to log in all the characters at once, and only have a finite amount of training you need done. For example, if you have one account, you can use them to create P.I. Alts, Industry Alts, and a Hauling Alt (in a non-deckable corp). And if you already have more than one account, you can do things like create additional cyno alts. For example, if you have a cap pilot and a subcap pilot, you can add two cyno alts on the subcap pilot account. And I’m sure many people can provide even more examples.
Also, do note that 2nd and 3rd character slots are useful if you plan to pay for training through isk, as MPTC’s are always cheaper than plex (they have a price ceiling of 485 plex in the NES).