I'm glad someone asked this! I don't plan on doing much selling, but it was very informative!
The first mini I was going to look at I was going to see on a Sunday, I was very excited and felt pretty sure I was going to get her, until I got a message on Friday that she was sold, I didn't even know anyone else was looking, I could have bumped up my appointment if I'd known. At the time I was very disappointed, but in the end I got my mini (well minis) and am very happy w/ how things have turned out.
I breed Nigerian Dwarf goats, and sometimes find myself in a situation that I'm not sure how to handle. I get alot of inquiries! But some I hear from once or twice and never again, some seem really interested and we stay in touch for a week or more before disappearing forever. Not long ago I had someone interested in a couple kids, after a week of promptly getting back to me I didn't hear from them for a while and someone else came along wanting to come and look, suddenly the first people were back in the picture. I ended up stalling until the 2nd people could come and look, they were undesided and wanted to come back w/ family, so I told the others I had deposits and didn't yet know which they were getting (not completely true, but I was sure they were serious, and still not completely sure about the 1st buyer), as it turned out the second ones took one the others were interested in and one other, and I guess the 1st ones realized it was a snooze you lose kind of thing and sent a deposit the next day for the other kid and one other.
I'm just never sure if I should say there are others interested, simply because I don't want to seem like I am pressuring them. For me I don't hold a kid unless I have a deposit, however, I will make an exception if I have someone scheduled to come out, and I will hold onto a kid for up to a week while someone gets transport arrangments. Also though, even if someone is coming out and I have several avaliable and they are not sure which they are interested in and someone else is interested in a certain one and wants to put down a deposit (or pick it up if it's ready), then I will mark that one as sold.