My problem is with you calling it an exploit (you said "exploiting". Exploits were Noctezuma without condition, Rbs not counting as doubles. Abusing exploits - "exploiting" - is close to cheating. Yet last LW was played exactly as it was intended by staff. As a proof look at Ghelas's words in this very thread that he considers current LW the fastest way to earn game money at the moment. So if staff member comments so it means that it was an intended effect by makers. Therefor no exploit and no exploiting.
You basically called people who won numerous Striker Rb (I'm one of them) cheaters the way I saw it, which is offensive. Poor choice of words maybe.
But leaving the word use behind - yes, it was the easiest way to earn some big worth fast that I can remember in UR. And something like that haven't happened before, unknown if will happen again and if so how often. So far I see no problem with it - ALL players had a splendid chance to earn valuable card (multiple copies in fact), some have used that chance succesfully. Ergo number of players happy. Any problem? Is Market busted now? Doesn't looks that way. Is Striker Rb "worthless because he was so easy obtainable"? No, his price is very high.
It was a rare, generous, positive occurence in my opinion. Why do you dislike it exactly? "I'd like it to be harder" - OK, but why? It's not like it happens every month, or every year - or, maybe, EVER happened in the history of UR even.