When it comes to granting permissions in Second Life users have to be careful. One second you are just minding your business and the next you have accepted a hug, bite, or something else from a stranger. I recently ran into the following in two stores and a club:
In all my time in Second Life this is the first time I have run into such a thing from stores or clubs. Normally when I go to purchase something I click on pay and then on the payment amount. Most tip jars are the same way. They give options for amounts and a spot to fill in a different amount. At no time is there a disclaimer that I am granting permission for the system to then take “any or all of” my Lindens “at any time, with no further warning or request”.
I would highly recommend if you run into such a thing to click on the “deny” button. Then let the store customer service/management know that you will not be purchasing items from their store because of that message.