Yes. Always assume that. I takes 1 sat to post. Get an average of how much you want to tip people each week and remove anything in excess of that. If you see the money you have on here is about the same amount of money you might lose to couch cushion, you're probably okay, and quite frankly, the site was not created with the intention for you to have more than that in your account anyway.

SN is not an exchange tho