Why do you wanna get boosted?

So recently i had to take a break from league. Not for any of the normal reasons, but for personal things. Now i'm pretty rusty. After i played lol every day i was actually getting pretty good. I had good map awarness and micro play. The only thing i have now is good macro. As it stands, i haven't had a good time every since i took that break. I keep going up against people who are alot better than me and i just end up feeling bad for my team. I used to have all the mechanics memorized but now i don't. It was like i wasn't at the level i used to be. It was like i was boosted by my past and now i can't have a fun time playing cause i'm always getting frustrated that i can't play as well as my opponents and teammates. I used to be able to carry my games and now i'm afraid to play a game because i know i'm gonna feed and not gonna be able to do anything.

My question is why would someone wanna get boosted? Why would you want to play with people who are just gonna stomp you? Why would you want to disappoint your team?

I don't understand why you'd want to get boosted to a rank you don't deserve. What's the point? I can see that you might want the rewards from the end of the season but it's only the begining middle of the season, but that's all right? I can't imagine why you wouldn't want to play a game that you can win...