The thing with agility is that it's a game until it's not. And it's not when you introduce ego. You are competing because of human ego, because you want to win. Nobody who is competing walks into a ring and says "oh boy, I hope we don't Q and only have lots of fun!" You might walk into a ring a few times without a lot of concern for the Q and with more focus on fun - but as time goes by the reason you continue to step into the ring is because you want to succeed.
Unless your other hobby is setting money on fire. Or Scrooge McDucking it into your money vault.
I also believe there's a difference between "we do a few trials a year, it's just for fun" and competing with seriousness - people who spend a fair portion of time and funds on training, traveling, competing. Not that either approach is correct or incorrect, but they are different. If you only do a few trials a year, then your perspective may be very different. Think about a kid who plays basketball in high school because he likes playing as opposed to a kid who plays basketball in high school with the hopes he will get a basketball scholarship to college and be drafted into the NBA later in life. Is one of those kids right or wrong because his approach to the game is different?
Everybody has their own goals in life with their dogs. Because somebody else has different ones than you doesn't mean you're right or wrong - it just means you have different goals. I don't really "get" World Team people... it's not something I want to do. I know several of them, I drink with them LOL, but they have different goals than I do. Doesn't make them wrong because that is their goal, doesn't make me wrong because it's not mine. Just different.
And finally... rehoming a dog, for whatever reason, doesn't automatically mean someone doesn't love them. Don't assume to know anybody's journey with their dog(s.) I still argue with myself on if keeping Pepper was the right move or not. Did I keep her because of how much I love her - or do I NOT love her enough to have let her be rehomed somewhere that would have been more ideal? There are people on this board who have rehomed dogs for a variety of reasons... a lack of love is not chief among the reasons I think of.