Why?
I am a costumer for their company, I paid for a product expecting certain services. When these services is not delivered, if I feel that it has harmed the overall value of the product, I can ask for my money to be returned.
Please do not mistaken me, I do really like Elite Dangerous, especially when science fiction and technology is my preferred theme in games. There are of course some incomplete things in the game and you can wave "beta" excuse flag as much as you like. I don't mind using my free time to test these things and provide comprehensive feedback to the developers. However, from my own experience, I've seen far too many games getting tons of feedback during beta only for the game to skip as is. Including bad UI, difficult controls, bad balance and sometimes incomplete features.
Everybody on the forums was like "its only a beta, it will change, it will get better" but it never did, even after release people still had hope. My point being, why should I get emotionally invested into testing and providing feedback, only for it to be ignored.
Look at how people were complaining about outfitting being difficult to find. What has developers done to resolve the solution? Changed some UI elements, making it no doubt better, but the core problem remains. Do they know why people hate outfitting their ships this much? Players struggle finding components they want, but they struggle even more to understand what are they doing wrong.
tl;dr
No wipe after gamma was my incentive to get into the game before 16th of December. If the incentive is taken away because of "reasons", then so be it, I'll just wait until 16th of December and ask for my extra £15 back. I do understand the need to reset the universe, for the sake of stability, for the sake of giving everyone a chance to get on with the story (if there is any) and I don't mind a wipe as long as players get to keep their credits balance.