Is there a limit as to how much money your Paypal account can hold?

I looked around the Paypal site but didn’t see anything on this. Let’s say you sold rare cars (or whatever) on eBay or elsewhere, and your account got into the hundreds of thousands, or millions of dollars range. Would they allow that? Would the IRS get flagged at some point?

Yes, there are limits: Why do Personal Accounts have a receiving limit?