It's automated by Upwork. Short-term/lower-paid jobs are supposed to cost fewer connects, whereas higher-priced/longer term jobs cost more. Sometimes, if a job gets very few bids, the number of connects required will decrease (though personally, I would treat that as a red flag - if nobody wants the gig, there's usually a good reason!). But it's not a perfect system, so sometimes you'll see connects charges that make little sense.
