I wouldn't worry about that Founder,
Everything has its price, from insurance to the pilot supply market.
I would wager that the money saved by a start-up airline employing the cheapest pilots they can get (usually newly qualified or hours building bods; let's face it - some work for nothing if they have to) more than outweighs any increased premiums foisted on them by their underwriters.
Airlines cannot operate without pilots, if the only pilots available are low hours then they will have to do... Whatever the cost of insuring them.