In order to receive any promotional rate, you will be required to authorize and agree that Cable ONE may obtain a consumer report about you in accordance with the Fair Credit Reporting Act from a consumer reporting agency in order to verify your eligibility to receive this and other offers as well as determining deposits and install fees required, if any.
The question of "when does it make sense?" can easily be rephrased as "how much money can I save?" and one of the biggest factors will be the price difference between combined internet and TV service or just internet. These are also the options that vary the most widely based on where you live, and the availability of promotions or contracts that can keep prices down for a short time.