Do you know why people pay for boost?
Because they keep losing their promos for the 12th time in a row because the games are completely one sided and the game expects you to play like 5 tiers higher in order to win. The second option is to play 100 games hovering on 85 - 100 lp and just hope luck is in your side and you get to win them.
And of course riot will never give us any data or statistics to hide their little rigged game under the excuse "People might find ways to abuse the system if we give data away blablabla".