Why do people do this?

I thought I'd stop encountering these guys as I climbed the ranks, but they keep coming.

"I'm gonna start a 15+10 then be in a losing position on move 30 with more time than I started with"

Why?

I thought I'd stop encountering these guys as I climbed the ranks, but they keep coming.

"I'm gonna start a 15+10 then be in a losing position on move 30 with more time than I started with"

Why?