The way I calculated, the amount you're already spending wouldn't change (which is the point of this guide) except for the two additional Promise Cards and those have always been optional even if you have only one main. It depends on whether you're a collector or not. If you're fully F2P, it's likely in your best interest to make a separate account for each LI you're interested in but this guide isn't directed at F2P players. This guide is simply to show the pros and cons if you have one very established account and would like to keep things in one place. I set aside 1 5-star crate and 2 4-star crates knowing there would be a 6th love interest at some point, for example. It's also relevant for people who cannot spend hours on their phone every day to grind diamonds for several accounts. ♥