but that's ok, just post an offer and keep telling people about Vexl, and it will start to grow.

 the way the web of trust works is friends and friends of friends so as people join and see offers the network begins to scale.

 If Bob knows Pam and you know Bob you can trade with Pam. if you guys share the same favourite pub or pizza delivery place you both know the restaurant so you can trade with each other. 

it will start to grow, every marketplace was empty in the beginning! if you wanna buy post an offer there, if you want to sell get that offer there and the next person that joins your WOT sees them!