"If I post some chips for sale on The Chip Board, and you buy all of them for $195.00.
We are both club members. I agree to accept a personal check.
You tell me you will put the check in the mail on Tuesday.
When do you expect me to put the chips in the mail to you? Same day ... Tuesday.
Also, Do you expect me to tell you when the check arrived? Yes, it's common courtesy.
Should I expect to find out from you when the chips arrived?" Tes, it's common courtesy.

Personally speaking ... I normally treat a CC & GTCC membership number the same as "The Good Housekeeping Seal Of Approval". Yes, there are a few stinkers among us ... but by far ... the overwhelming majority of club members are honest, decent people to deal with.