That’s the tricky part about domains. You can always compare other domain sales but it doesn’t mean that your buyer will match that.
It all comes down to how badly the company needs the domain and whether you have the balls to say no to large offers. I recently had an offer of 30K for a domain and I completely ignored it. He hasn’t come back...this happens more than you think. It’s easy to say no but you better be prepared to not get the sale.
In this instance, I feel like the value will increase over time and there are a lot of different potential end users. So, in this case other than under armour how many other possible end users are there? Not saying the domain sold cheap...but can’t be too greedy with domains or you sell none.