Can you offer other items for sale to successful bidders when they contact you

[Woodfinn]

Or do ebay have some powers for detecting this?

I’m not quite sure what you mean?
But eBay have become very strict about sellers trying to sell goods outside of eBay.

You mean if you were selling a pram on eBay and then offered the successful bidder the accessories to it at an additional cost?

Yes, something like that. How would ebay know if I did that?

Yes they would know. I guess they pick up on key words in the messaging system and you will get a warning first, then an account suspension.

But one way to get round that would be, rather than using eBay messaging system, check the PayPal payment and there would be an email address linked to it, then you could just email them directly.

Thanks, 19lottie!