There only a slight drop in GTEAm field this year- large HY field means there's a bid step up in quality of cars overall and probably budgets so makes sense to pay for experience given all the costs of getting cars there.
Over the last 6 years or so pre Hypercar both LMP1 and GTEPro fields dwindled and over those years there were more (and so new teams) coming into to both LMP2 and GTEAm.
Plus there's 2023 factor giving drivers incentive to stay loyal and sign up for WEC teams over other series.
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