Splits are usually generous because in the simulated model the firm is not risking capital; its revenue is evaluation fees. Read the payout terms: minimum profit before withdrawal, payout frequency, caps on the first payouts, and the consistency-rule applied at payout time.
A high split on an account you cannot get paid from is worth nothing.
Example: a 90/10 split on a $4,000 profit pays you $3,600. If the firm caps the first payout at $1,500, the remainder must stay in the account and remain at risk.
Related: funded-account, consistency-rule, prop-firm, scaling-plan