Shareholders (and let's be honest, hype buyers) may be happy now. We'll see how happy they are if BTC takes a dump!

If this was a brazen way to boost themselves by jumping on another hype train they may live to regret that. Ideally it's a clear-eyed financial decision but there's no way of controlling how it's going to be perceived by others.
It certainly is working wonders for the company now. The average joe like me has never heard of microstrategy but now it's everywhere in the crypto space. It's exploring new markets and taking advantage of free publicity. Evein if the investment doesn't bring the expected profit it's still going to be good for them (most likely). I'm positive that if they hold it for another 2-3 years they will make money, even if there's a dump in the coming months.