Is it me or the game?

Some questions from someone relatively new to the game: - Can I basically quit the match if a Kit is in Showdown or Duels or is this a case of "git gud"? - When I get to about 400 trophies with my level 7 brawlers, almost every round contains one or two people at level 11 who brush off my attacks and waste me quicky. What is the point of having level 11 fight level 7? Is there no real matchmaking or is this just pay2win, so people pay to get to 11? - Speaking of prices: are people actually paying these insane amounts? 20 bucks to get a single brawler to 11, even more for one single brawler. For that amount I can get a PS5 game in sale and have fun for like 100 hours. I mean I could understand it if you unlock a few brawlers for typical DLC prices. Obviously some people pay this or else they would not do it... but still, who pays so much money for so few benefit?

Thanks and all the best!