At what point does a pet parent's request become unreasonable?

[Mokina]

Coincidently I’ve just posted this:

Unusual request from HOs involving some expense

Hello all. I am currently doing a sitting where I’ve been asked an unusual request. The HOs are on holidays and they asked me to search for some specific items in the house that they would like to lend to a friend for a wedding and take photographs of these. So I did it. I am then asked to send some of these items on the post, buy the material for the wrapping and postage. I am told that I’ll be reimbursed, but I feel quite uncomfortable on this request. I have been told them to let them kn…

Although it’s not too bad compared to other requests I’ve read in here