Your tiny mind can't comprehend that Heroic already play in ESL Pro League themselves so they can't lend any players to stand-in.
And in the meantime, Dig are already busy preparing and playing for ECS too.
It's better to GIVE experience by letting young up and coming players from the scene play in these high level environments. Higher tier players wouldn't have jack shit playing a couple of games with Astralis.
And YES, there are high level teams in these matches, but when notaN is playing well or average, other teams could have a look at him and give him a shot. It's not about winning, because they already risk the stability by benching Karrigan.