I think they won’t let it be used on base stations because they come straight from Valve and Pimax wants to minimize the hit they will be taking by giving backers this $100 coupon.
So they are only allowing the coupon to be used on products made by them to minimize cost, however most of the modules like hand tracking and wireless are said to be “developed by their partners” and not Pimax, so why are we able to spend the coupon on modules but not base stations.
Maybe they would allow it for base stations but they would need to charge a much higher price than they did during the kickstarter. I believe Valve is charging $65 per base station and Pimax would be breaking even or even losing money on selling them for $75, possibly even losing money.
Maybe they could sell to backers at more than $100 a base station. This would still be a fair price to me.