Having experience showing Rotties where it often seemed far more were nasty than nice, I do want to say I have never had any Basenji negative show experience. They were helpful, kind and supportive to rank newbies, even when my bitch won. In fact especially kind to me and my child when she won. Maybe because Rotties have so many and there is anonymity in vast numbers while in Basenjis everyone knows everyone or someone who does, I really do think most are at least nice to your face.
I would totally support the suggestion that you call the breeder, have the dog evaluated, and then decide. Perhaps even if you only do a few shows to see how you like it. There is no rush to neuter, so I can't imagine the breeder wouldn't be happy to let you wait a few months and get your feet wet. Hate it? Neuter and buy bully sticks (that was funny Chelsie!)
I do want to say that I know many who show and do not pay out major money. They show within driving distance, or stay in cheaper hotels, and either do their own handling, their breeder helps handle or a knowledgeable show friend who is willing to go in the ring in exchange for hard labor helping THEM at the show, etc.
Sayblee was a monster, would not allow me to show her. I took her in the ring ONCE, she screamed, she wouldn't move, I lost my shoe in the mud and I was done. I put a handler on her– fortunately a good friend who charged me only $50 a day to take and show her (she is now an AKC judge and she and her husband still talk about the screaming Sayblee). If she saw me or my daughter, she stopped dead in the ring and it was over. So not only did I pay for her, for her shows (and the handling classes I took prior expecting to show her), I didn't get to see her ONCE other than hid behind posts and garbage bins so far back I could barely see. It was not fun for me. But she did finish very fast. Since I agreed to get her title or at least spend a year trying, I and my pocketbook were happy. Hopefully you will do much better with your dog and have less stupidity than I did with her. I loved every atom of her making, but I was not the boss for sure.
Be warned, if the bug bites you, your life is over, lol. Showing can be great camaraderie and fun and addicting. And if you find you don't like it, consider agility, lure coursing, obedience etc.