The mechanics of why stacking compounds
MCAs typically debit a fixed amount each business day — for example, around $339/day on a $50k advance at a 1.28 factor over 9 months. That debit alone is often 8-12% of average daily deposits. Now stack a second $30k advance, often at a higher factor than the first because it's a riskier second-position deal — call it ~$220/day. Now roughly $560/day is leaving your account before any operating expenses.
If your average daily deposits are $4,000, the two stacked debits eat about 14% of revenue right off the top — before payroll, before rent, before COGS. Net margins for many small businesses run in the 5-15% range. The math gets very tight, very fast. That's before per-debit ACH fees and other stacked charges — see Hidden fees to watch out for.