DigiPack and Extras Research

I have looked into how bands in our genre market their album and what they offer to fans. Here I have looked at The Wombats store on their website. They sell an 'exclusive limited edition fan boxset' to fans which includes various things that I could consider including in my digipack or as an extra.
They include a vinyl of the album, which is not that unusual for the genre, however it is not something I would consider advertising or promoting as much. If I was to offer an alternative to a CD it would be the option of  a download as this is more accessible for our audience.
The T-shirt is an interesting idea to consider as many bands have these. Having an artist create a T-shirt for you as The Wombats have would also help to increase popularity and widen the audience as fans of the Artist would then be encouraged to listen to the band by association.
Offering alternative covers and extra photos or postcards as The Wombats have is something I would strongly consider including in the digipack as it encourages fans to buy it as oppose to download it because they want exclusive features. This is clearly a strong selling point so including these things would make the digipack more desirable.
Offering a bonus track is another selling point as fans would not want to miss out on a song by the band. This is something I would consider including as a special feature of the digipack.
Having anything signed would also make it more appealing and so this is also something to consider if I was to include any information such as this inside my digipack or on the magazine advert.

Looking at this I have gained some ideas into what to include in my digipack and how to make the it sound more appealing if I was to advertise it.