Every woman there is looking to be compensated for their time spent providing companionship, and providing sex. That's what the site's for. It's sex work. The term "gold digger" doesn't really apply, since that's a pejorative targeted at men and women who aren't up front about their intentions to trade sex for cash, gifts, and favors.
While some prospective sugar babies will offer "pay per play" agreements, that's not really what the site's for, and it's not they're looking for; it's for amateur and pro sex workers to find bigger agreements with men who are looking for repeat companionship over a length of time, usually spanning both sexual and non-sexual time spent. If you're looking to save money seeing a woman for sex for a couple hours every week or two, it's not really for that. But if you'd like to see a woman once or more per week for hours at a time, doing dating activities as well as having sex, you can save a ton of money compared to a regular escort's multi-hour or overnight rate.
If you're paying say, 3k or 4k once a month to see a companion once or twice a week for 5-6 hours at a time, you can save a ton of money compared to hiring an escort. Most sugar babies are highly preferential in their availability to their sugar daddy too, so scheduling can be much easier seeing someone who only has a few regular clients versus someone who has dozens on a less consistent basis. On top of that, the actual personal bond allowed in these types of relationships is often more involved due to the greater length of time spent; many companions will prioritize learning about you, and will often be more willing to engage in emotional labor that a regular service provider is less likely to feel comfortable offering.
Having had some friends who have sugared in the past, I can say most guys are just there for a couple of rendezvous and wind up ghosting. They can't really afford it, but they like the fantasy. If a dude (or lady) can't afford a few grand a month, I'd say it's not for you; you're going to spend so much time texting and bullshitting that you might as well spend that time making money and then hire a traditional escort a few times. But for those in the right position, there are some real gems to be found, and the convenience factor can be a massive benefit.