You can buy T-shirt’s, stem caps, all sorts of trinkets on the indigogo as well.
Interestingly they will get all the money pledged (it’s not an all or nothing deal, like Kickstarter) so they can just refund the people who ‘bought’ frames then fulfill the T-shirt’s etc. Think that’s about £1500 worth.
Which may or may not have been their goal all along.