Yep, everyone wants something for nothing on FB. You’re less likely to get questions and go back & forth with someone on eBay messenger than FB! I always hate the ding! “Hello, is this item still available?” 
I went round and round with one lady with measurements in a western saddle- one that is currently being sold so you can access manufacturer info still. I took photos and whatever she wanted. She wanted me to be home on Tuesday to come see it and I said, no. I said I don’t meet people I don’t know at my home and I have this thing I do called work during the day. I offered a public space to meet and never heard back. Ugh. High school 4h kids are significantly better to deal with!!