To me, Project Pokémon is, first and foremost, a community about researching Pokémon and collecting events. There's nothing to be gained from joking answers when someone asks a question about how some game mechanic works; it's annoying at best and causes actual confusion at worst. The tone of the forums matches the nature of the topics at hand.
Additionally, I understand if you feel that staff are being a tad too professional, but excessive friendliness may also be very uncomfortable. That feeling of uncomfortableness may expand rapidly into the territory of feeling sexually harrassed as well; people can and will be easily offended or feel sexually harrassed. The less opportunities for that to happen, the better, I'd argue. I believe I speak for everybody if I say that avoiding insinuations of sexual harrassment, justified or not, should be a priority of all staff members. That aside, not choosing a serious tone carries the risk of the message not to reach the recipient because they think they needn't take the message seriously.
I find the recent trend of corporations and other groups to be faux-friendly rather annoying. A prime example is Discord Inc., who seem to feel the need to add memes to everything. The latest corporate blog post was written by Nelly, "Chief Robot Hamster. Eater of cheeses. Maker of boops." I believe it's rather obvious that this trend becomes quite tiresome after some time.
I am absolutely not just a bitter old man who's become so much of a cynic that people having fun around him annoys him already.