Wow, you sure have a lot to say about APA. Despite many here from different parts of the country refuting the absoluteness of your complaints, you keep on blasting the league. We get it. You don't like it. Lots of us do.
And as I've said before, it's not like that everywhere. I have 15 years of experience with our league here, so I've seen a lot, for how it works, here. And it's not the disaster you proclaim. We have a few players with over 600 fargos in our league, and several in the 500's, so I expect those guys practice

I know that many play in other leagues, as well as non APA tournaments. Our pool room has (12) 9' Diamonds and its busy all week.
Our LO has divisions all over Maine, in at least 12 communities, with a couple more being added next year. So I know they all run similarly.
Will there be "some" sandbagging, sure. Any league system will have that. It's human nature for some people to try and cheat, in anything.
Do you play for money? Do you disclose your real speed when matching up? Isn't that just sandbagging?
I've found that it's no where near as prevalent as many, including you, would suggest. Here, in my part of the world. You talk about players not practicing, if they are that bad, how do you think they are gonna be good enough to hide their speed? Only way to have that happen is to have someone good enough to be convincing. And then to have the attitude to do it. And to decide to take the extra effort to do it. And not get caught. I call BS.
Go play something you like, and leave the stuff you don't like alone, where the people who do like it can enjoy it. Stop letting that success bother you so much.