Hello,
I've read most of the discussion and I think you're very generous to give so much time to the other part to do the transaction. One month is a lot of time. If you've given all the informations and if you have no answer, then this guy is not so interested.
Given the volume of a bike, it's something I prefer not to receive via mail. I prefer to see the seller (or the buyer if I'm the seller), the object to buy/sell, and be able to discuss about it between four eyes. Where I work (i'm an hotliner for a site where you find computer hardware), we always give an answer in 48 hours. Always !
It's now an habit for me, personally, to reply quickly and I also consider that if I send an e-mail to someone who sells something, if he really wants to sell, I want a quick reply from him (quick equals no more than 48 hours, I don't count the week-ends). It's written in my e-mails : I'm waiting for a reply in no more than 48 hours, if no reply, I consider the person doesn't want to sell/is not serious and I give up. So when i read that you've given one month ! Woooow !
I suppose that to have always taken these precautions prevented me to deal with bad people. Here in France, we have an aftermarket site, leboncoin.fr, where it's possible to find a lot of things (at the moment, nearly 65 million items listed), I used it a lot back in time but the more the time goes, the more it becomes a pain in the a**. I send 10 messages, I receive no more than 2 answers (including one after 48 hours), it's stressful ! ebay is so much better ! I saw on leboncoin, a message I sent for a Specialized MTB in October (2022), the item is still listed, the guy still hasn't read my message...
Like I see in the other replies on this thread, I think you should sell to people locally, meet them, talk with them, it'll be better for you and for them !
Have a good day !
W.