When the ID's and purchases were seen I did not want others knowing what I was buying or how much I paid.

There is a lot of people here that have nothing better to do that stalk other members to see what they purchase and what feedback was left etc only to then take any feedback left out of context to cause an incredible amount of trouble by assuming the wrong thing and not asking to find out the reasons behind the feedback.

Also as I (on another ID) sell what I buy I do not want others knowing what I got and how much I paid for it.

No sellers do not have the option to have private feedback.

They used to years ago but it was changed as buyers were not able to see how trustworthy a seller was.