jecasc - 9:20 am on Apr 3, 2012 (gmt 0)
Fact is that Paypal according to their TOS has the right to freeze your account and hold all money for some time.
If you can take even the slim chance of loosing access to your funds for an indefinite amount of time then you can leave your money in your Paypal account.
If you can't - like I do, then remove it regularly. I only leave a small amount in it for eventual chargebacks or refunds.
Also AFAIK Paypal does not pay any interest. Currently I get 2.7% for the money on my call account at my local bank.