Am I being unreasonable?

[The Lukas]

I have my 2008 yamaha xt125x advertised locally and this nipper really wants it but is getting half his money off his Grandad. Now this nipper apparently has been stung a few times with Chinese learner bikes and before his Grandad will give him the money he wants it checked out in a garage about 25miles away which I've never heard of. They have offered to trailor it away but won't let me hold full asking price while he takes it away and I can't be bothered to go with them because I've got much better things to do. So i've told them either give me full money (not half) for me to hold while they get it checked out or get someone to check it out at my house. Am I being unreasonable?